chore: update version to 0.5.0 [skip ci]

Reviewed-on: #7

.forgejo/workflows/publish-and-deploy.yaml

@@ -22,7 +22,7 @@ jobs:
 
       - name: Login to Registry
         run: |
-          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login ${{ env.REGISTRY }} -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login ${{ env.REGISTRY }} -u "${{ vars.REGISTRY_USERNAME }}" --password-stdin
 
       - name: Determine Version
         id: version

.gitignore

@@ -3,4 +3,3 @@ dist/
 .DS_Store
 *.log
 .vite/
-

.husky/pre-commit

@@ -0,0 +1,7 @@
+# Skip in CI environments
+if [ -n "$CI" ] || [ -n "$FORGEJO_ACTIONS" ] || [ -n "$GITHUB_ACTIONS" ]; then
+  echo "Skipping pre-commit hooks in CI environment"
+  exit 0
+fi
+
+npx lint-staged

.lintstagedrc.json

@@ -0,0 +1,4 @@
+{
+  "*.{ts,tsx,js,jsx}": ["eslint --fix", "prettier --write"],
+  "*.{json,css,md}": ["prettier --write"]
+}

.prettierignore

@@ -0,0 +1,5 @@
+node_modules
+dist
+*.min.js
+package-lock.json
+

.prettierrc.json

@@ -0,0 +1,9 @@
+{
+  "semi": true,
+  "trailingComma": "es5",
+  "singleQuote": true,
+  "printWidth": 100,
+  "tabWidth": 2,
+  "useTabs": false,
+  "arrowParens": "always"
+}

README.md

@@ -1,21 +1,54 @@
 # Slime Genesis - ECS RPG PoC
 
-A complete proof of concept for **Slime Genesis: The Awakening of the Entity** built with vanilla JavaScript using an Entity Component System (ECS) architecture.
+A complete proof of concept for **Slime Genesis: The Awakening of the Entity** built with TypeScript using an Entity Component System (ECS) architecture.
 
 ## Quick Start
 
 1. **Install dependencies:**
+
    ```bash
    npm install
    ```
 
 2. **Run the development server:**
+
    ```bash
    npm run dev
    ```
 
 3. **Open your browser** to the URL shown (usually `http://localhost:5173`)
 
+## Development
+
+- **Format code:**
+
+  ```bash
+  npm run format
+  ```
+
+- **Check formatting:**
+
+  ```bash
+  npm run format:check
+  ```
+
+- **Lint code:**
+
+  ```bash
+  npm run lint
+  ```
+
+- **Fix linting issues:**
+
+  ```bash
+  npm run lint:fix
+  ```
+
+- **Build for production:**
+  ```bash
+  npm run build
+  ```
+
 ## Controls
 
 - **WASD** or **Arrow Keys**: Move your slime
@@ -27,6 +60,7 @@ A complete proof of concept for **Slime Genesis: The Awakening of the Entity** b
 ## Features
 
 ### Core Systems
+
 - ✅ **ECS Architecture**: Entity Component System for flexible game design
 - ✅ **Real-time Combat**: Fast-paced action combat with form-specific styles
 - ✅ **Evolution System**: Three paths (Human, Beast, Slime) that change based on absorption
@@ -35,15 +69,19 @@ A complete proof of concept for **Slime Genesis: The Awakening of the Entity** b
 - ✅ **RPG Systems**: Stats, leveling, XP, inventory, equipment
 - ✅ **AI System**: Intelligent creature behaviors (wander, chase, combat, flee)
 - ✅ **Projectile System**: Skills can create projectiles (Water Gun, etc.)
+- ✅ **Mutation System**: Gain mutations like Hardened Shell, Electric Skin, Bioluminescence
 
 ### Graphics & Polish
+
 - ✅ **Animated Slime**: Smooth morphing blob with jiggle physics
 - ✅ **Combat Effects**: Damage numbers, attack indicators, particle effects
 - ✅ **Absorption Visuals**: Swirling particles and color transitions
 - ✅ **Stealth Indicators**: Visibility meters and detection warnings
+- ✅ **Glow Effects**: Bioluminescence mutation creates a pulsing glow effect
 - ✅ **Polished UI**: Health bars, XP bars, skill hotbar, stat displays
 
 ### Skills
+
 - **Water Gun**: Shoot a jet of water at enemies
 - **Fire Breath**: Breathe fire in a cone
 - **Pounce**: Leap forward and damage enemies
@@ -58,6 +96,7 @@ This game uses a pure ECS (Entity Component System) architecture:
 - **Systems**: Logic processors (RenderSystem, CombatSystem, AbsorptionSystem, etc.)
 
 This architecture makes it easy to:
+
 - Add new skills and abilities
 - Create mutations and combinations
 - Extend creature behaviors
@@ -67,32 +106,65 @@ This architecture makes it easy to:
 
 ```
 src/
-├── core/              # ECS framework
+├── core/                    # ECS framework and utilities
-│   ├── Engine.js      # Main game loop
+│   ├── Engine.ts            # Main game loop
-│   ├── Entity.js      # Entity manager
+│   ├── Entity.ts            # Entity manager
-│   ├── Component.js   # Base component
+│   ├── Component.ts         # Base component
-│   └── System.js      # Base system
+│   ├── System.ts            # Base system
+│   ├── Constants.ts         # Enums and constants
+│   ├── EventBus.ts          # Event system
+│   ├── LevelLoader.ts       # Level loading
+│   ├── Palette.ts           # Color palette
+│   ├── PixelFont.ts         # Pixel font rendering
+│   ├── SpriteLibrary.ts     # Sprite definitions
+│   └── TileMap.ts           # Tile map system
 ├── components/              # All game components
-│   ├── Position.js
+│   ├── Position.ts          # Position and rotation
-│   ├── Health.js
+│   ├── Velocity.ts          # Movement velocity
-│   ├── Stats.js
+│   ├── Health.ts            # Health and regeneration
-│   ├── Evolution.js
+│   ├── Sprite.ts            # Visual representation
-│   └── ...
+│   ├── Stats.ts             # Attributes and leveling
+│   ├── Combat.ts            # Combat stats and attacks
+│   ├── Evolution.ts         # Evolution paths and mutations
+│   ├── Skills.ts            # Skill management
+│   ├── SkillProgress.ts     # Skill learning progress
+│   ├── Absorbable.ts        # Absorption mechanics
+│   ├── Stealth.ts           # Stealth state
+│   ├── Intent.ts            # Action intent
+│   ├── Inventory.ts         # Items and equipment
+│   └── AI.ts                # AI behavior data
 ├── systems/                 # All game systems
-│   ├── RenderSystem.js
+│   ├── RenderSystem.ts      # Rendering
-│   ├── CombatSystem.js
+│   ├── InputSystem.ts       # Input handling
-│   ├── AbsorptionSystem.js
+│   ├── PlayerControllerSystem.ts  # Player control
-│   └── ...
+│   ├── MovementSystem.ts    # Movement physics
+│   ├── CombatSystem.ts      # Combat logic
+│   ├── AISystem.ts          # AI behavior
+│   ├── AbsorptionSystem.ts  # Absorption mechanics
+│   ├── StealthSystem.ts     # Stealth mechanics
+│   ├── SkillSystem.ts       # Skill activation
+│   ├── SkillEffectSystem.ts # Skill visual effects
+│   ├── ProjectileSystem.ts  # Projectile physics
+│   ├── DeathSystem.ts       # Death handling
+│   ├── HealthRegenerationSystem.ts  # Health regen
+│   ├── VFXSystem.ts         # Visual effects
+│   ├── UISystem.ts          # UI rendering
+│   └── MenuSystem.ts        # Menu management
 ├── skills/                  # Skill system
-│   ├── Skill.js
+│   ├── Skill.ts             # Base skill class
-│   ├── SkillRegistry.js
+│   ├── SkillRegistry.ts     # Skill registry
 │   └── skills/              # Individual skills
+│       ├── FireBreath.ts
+│       ├── Pounce.ts
+│       ├── StealthMode.ts
+│       └── WaterGun.ts
 ├── items/                   # Item system
-│   ├── Item.js
+│   ├── Item.ts              # Base item class
-│   └── ItemRegistry.js
+│   └── ItemRegistry.ts      # Item registry
 ├── world/                   # World management
-│   └── World.js
+│   └── World.ts             # World setup
-└── main.js            # Entry point
+├── GameConfig.ts           # Game configuration
+└── main.ts                 # Entry point
 ```
 
 ## Gameplay Loop
@@ -103,6 +175,7 @@ src/
 4. **Evolve**: Your form changes based on what you absorb
 5. **Level Up**: Gain XP, increase stats, unlock new possibilities
 6. **Stealth**: Use form-specific stealth to avoid or ambush enemies
+7. **Mutate**: Gain powerful mutations like Hardened Shell, Electric Skin, or Bioluminescence
 
 ## Evolution Paths
 
@@ -110,13 +183,30 @@ src/
 - **Beast Path**: Absorb beasts to become a predator, gain physical power
 - **Slime Path**: Maintain your original form, gain unique abilities
 
+## Mutations
+
+- **Hardened Shell**: Increased defense (requires high Constitution)
+- **Electric Skin**: Damage reflection (requires high Intelligence)
+- **Bioluminescence**: Glowing light source (requires high Human evolution)
+
 ## Technical Details
 
-- **No External Dependencies**: Pure vanilla JavaScript (except Vite for dev server)
+- **TypeScript**: Full type safety and modern JavaScript features
+- **Vite**: Fast development server and build tool
 - **Canvas 2D**: High-performance rendering with Canvas API
+- **ESLint**: Code linting with TypeScript support
+- **Prettier**: Code formatting
+- **Husky**: Pre-commit hooks (skips in CI environments)
 - **Modular Design**: Easy to extend and modify
 - **ECS Pattern**: Scalable architecture for complex game mechanics
 
+## Code Quality
+
+- **TypeScript**: Full type coverage, no `any` types
+- **ESLint**: Zero warnings policy
+- **Prettier**: Consistent code formatting
+- **Pre-commit Hooks**: Automatic formatting and linting before commits
+
 ## Future Enhancements
 
 - More skills and mutations

VERSION

@@ -1 +1 @@
-0.1.0
+0.5.0

eslint.config.js

@@ -1,26 +1,39 @@
-import js from "@eslint/js";
+import js from '@eslint/js';
-import globals from "globals";
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+import prettier from 'eslint-config-prettier';
 
 export default [
   js.configs.recommended,
+  ...tseslint.configs.recommended,
+  prettier,
   {
     languageOptions: {
       ecmaVersion: 2022,
-            sourceType: "module",
+      sourceType: 'module',
       globals: {
         ...globals.browser,
         ...globals.node,
-                performance: "readonly",
+        performance: 'readonly',
-                requestAnimationFrame: "readonly",
+        requestAnimationFrame: 'readonly',
       },
     },
+    files: ['**/*.ts', '**/*.tsx'],
     rules: {
-            "no-unused-vars": ["error", {
+      '@typescript-eslint/no-unused-vars': [
-                "argsIgnorePattern": "^_",
+        'error',
-                "varsIgnorePattern": "^_"
+        {
-            }],
+          argsIgnorePattern: '^_',
-            "no-console": "off",
+          varsIgnorePattern: '^_',
-            "indent": ["error", 2],
         },
+      ],
+      '@typescript-eslint/no-explicit-any': 'warn',
+      'no-console': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-non-null-assertion': 'warn',
+    },
+  },
+  {
+    ignores: ['dist/**', 'node_modules/**', '*.config.js'],
   },
 ];

index.html

@@ -1,31 +1,57 @@
 <!DOCTYPE html>
 <html lang="en">
+
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Slime Genesis - PoC</title>
     <style>
+        * {
+            box-sizing: border-box;
+        }
+
         body {
             margin: 0;
             padding: 0;
+            width: 100vw;
+            height: 100vh;
             display: flex;
             justify-content: center;
             align-items: center;
-            min-height: 100vh;
             background: #1a1a1a;
             font-family: 'Courier New', monospace;
+            overflow: hidden;
         }
+
         #game-container {
-            border: 2px solid #4a4a4a;
+            width: 100%;
+            height: 100%;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            background: #000;
+        }
+
+        #game-canvas {
+            display: block;
+            image-rendering: pixelated;
             box-shadow: 0 0 20px rgba(0, 255, 150, 0.3);
+            border: 2px solid #4a4a4a;
+
+            /* Simplified scaling: Aspect ratio determines size, strictly contained */
+            width: calc(100% - 500px);
+            min-width: 640px;
+            height: auto;
+            aspect-ratio: 4 / 3;
         }
     </style>
 </head>
+
 <body>
     <div id="game-container">
         <canvas id="game-canvas" tabindex="0"></canvas>
     </div>
-    <script type="module" src="/src/main.js"></script>
+    <script type="module" src="/src/main.ts"></script>
 </body>
-</html>
 
+</html>

package.json

@@ -7,14 +7,25 @@
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview",
-    "lint": "eslint src",
+    "lint": "eslint src --max-warnings 0",
-    "lint:fix": "eslint src --fix"
+    "lint:fix": "eslint src --fix",
+    "format": "prettier --write \"src/**/*.{ts,tsx,js,jsx,json,css,md}\"",
+    "format:check": "prettier --check \"src/**/*.{ts,tsx,js,jsx,json,css,md}\"",
+    "prepare": "husky || true"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.2",
+    "@typescript-eslint/eslint-plugin": "^8.52.0",
+    "@typescript-eslint/parser": "^8.52.0",
     "eslint": "^9.39.2",
+    "eslint-config-prettier": "^10.1.8",
     "globals": "^17.0.0",
+    "husky": "^9.1.7",
+    "lint-staged": "^16.2.7",
+    "prettier": "^3.7.4",
     "terser": "^5.44.1",
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.52.0",
     "vite": "^7.3.0"
   }
 }

portainer.yml

@@ -2,7 +2,7 @@ name: slime
 
 services:
   app:
-    image: git.jusemon.com/jusemon/slime:0.1.0
+    image: git.jusemon.com/jusemon/slime:0.5.0
     restart: unless-stopped
 
 networks:

src/GameConfig.ts

@@ -1,38 +1,41 @@
 /**
- * Centralized Game Configuration
+ * Centralized Game Configuration containing thresholds, rates, and balancing constants.
- * Thresholds, rates, and balancing constants
  */
 export const GameConfig = {
+  /** Evolution related constants */
   Evolution: {
     totalTarget: 150,
     thresholds: {
       hardenedShell: { constitution: 25 },
       electricSkin: { intelligence: 25 },
-      glowingBody: { human: 50 }
+      glowingBody: { human: 50 },
-    }
+    },
   },
 
+  /** Absorption related constants */
   Absorption: {
-    range: 80,
+    range: 30,
     healPercentMin: 0.1,
     healPercentMax: 0.2,
     skillAbsorptionChance: 0.3,
     mutationChance: 0.1,
-    removalDelay: 3.0, // Seconds after death
+    removalDelay: 3.0,
   },
 
+  /** Combat related constants */
   Combat: {
     knockbackPower: 150,
     defaultAttackArc: 0.5,
     damageReflectionPercent: 0.2,
-    hardenedShellReduction: 0.7
+    hardenedShellReduction: 0.7,
   },
 
+  /** AI behavior related constants */
   AI: {
     detectionAwarenessThreshold: 0.7,
     passiveAwarenessThreshold: 0.95,
     fleeAwarenessThreshold: 0.5,
     awarenessLossRate: 0.5,
-    awarenessGainMultiplier: 2.0
+    awarenessGainMultiplier: 2.0,
-  }
+  },
 };

src/components/AI.js

@@ -1,52 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class AI extends Component {
-  constructor(behaviorType = 'wander') {
-    super('AI');
-    this.behaviorType = behaviorType; // 'wander', 'patrol', 'chase', 'flee', 'combat'
-    this.state = 'idle'; // 'idle', 'moving', 'attacking', 'fleeing'
-    this.target = null; // Entity ID to target
-    this.awareness = 0; // 0-1, how aware of player
-    this.alertRadius = 150;
-    this.chaseRadius = 300;
-    this.fleeRadius = 100;
-        
-    // Behavior parameters
-    this.wanderSpeed = 50;
-    this.wanderDirection = Math.random() * Math.PI * 2;
-    this.wanderChangeTime = 0;
-    this.wanderChangeInterval = 2.0; // seconds
-  }
-
-  /**
-     * Set behavior type
-     */
-  setBehavior(type) {
-    this.behaviorType = type;
-  }
-
-  /**
-     * Set target entity
-     */
-  setTarget(entityId) {
-    this.target = entityId;
-  }
-
-  /**
-     * Clear target
-     */
-  clearTarget() {
-    this.target = null;
-  }
-
-  /**
-     * Update awareness
-     */
-  updateAwareness(delta, maxAwareness = 1.0) {
-    this.awareness = Math.min(maxAwareness, this.awareness + delta);
-    if (this.awareness <= 0) {
-      this.awareness = 0;
-    }
-  }
-}
-

src/components/AI.ts

@@ -0,0 +1,73 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for AI behavior and state.
+ */
+export class AI extends Component {
+  behaviorType: string;
+  state: string;
+  target: number | null;
+  awareness: number;
+  alertRadius: number;
+  chaseRadius: number;
+  fleeRadius: number;
+  wanderSpeed: number;
+  wanderDirection: number;
+  wanderChangeTime: number;
+  wanderChangeInterval: number;
+
+  /**
+   * @param behaviorType - The initial behavior type
+   */
+  constructor(behaviorType = 'wander') {
+    super(ComponentType.AI);
+    this.behaviorType = behaviorType;
+    this.state = 'idle';
+    this.target = null;
+    this.awareness = 0;
+    this.alertRadius = 60;
+    this.chaseRadius = 120;
+    this.fleeRadius = 40;
+
+    this.wanderSpeed = 20;
+    this.wanderDirection = Math.random() * Math.PI * 2;
+    this.wanderChangeTime = 0;
+    this.wanderChangeInterval = 2.0;
+  }
+
+  /**
+   * Set the behavior type for this AI.
+   * @param type - The new behavior type (e.g., 'wander', 'patrol', 'chase')
+   */
+  setBehavior(type: string): void {
+    this.behaviorType = type;
+  }
+
+  /**
+   * Set a target entity for the AI to interact with.
+   * @param entityId - The ID of the target entity
+   */
+  setTarget(entityId: number): void {
+    this.target = entityId;
+  }
+
+  /**
+   * Clear the current target.
+   */
+  clearTarget(): void {
+    this.target = null;
+  }
+
+  /**
+   * Update the AI's awareness level.
+   * @param delta - The amount to change awareness by
+   * @param maxAwareness - The maximum awareness level
+   */
+  updateAwareness(delta: number, maxAwareness = 1.0): void {
+    this.awareness = Math.min(maxAwareness, this.awareness + delta);
+    if (this.awareness <= 0) {
+      this.awareness = 0;
+    }
+  }
+}

src/components/Absorbable.js

@@ -1,54 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Absorbable extends Component {
-  constructor() {
-    super('Absorbable');
-    this.evolutionData = {
-      human: 0,
-      beast: 0,
-      slime: 0
-    };
-    this.skillsGranted = []; // Array of skill IDs that can be absorbed
-    this.skillAbsorptionChance = 0.3; // 30% chance to absorb a skill
-    this.mutationChance = 0.1; // 10% chance for mutation
-    this.absorbed = false;
-  }
-
-  /**
-     * Set evolution data
-     */
-  setEvolutionData(human, beast, slime) {
-    this.evolutionData = { human, beast, slime };
-  }
-
-  /**
-     * Add a skill that can be absorbed
-     */
-  addSkill(skillId, chance = null) {
-    this.skillsGranted.push({
-      id: skillId,
-      chance: chance || this.skillAbsorptionChance
-    });
-  }
-
-  /**
-     * Get skills that were successfully absorbed (rolls for each)
-     */
-  getAbsorbedSkills() {
-    const absorbed = [];
-    for (const skill of this.skillsGranted) {
-      if (Math.random() < skill.chance) {
-        absorbed.push(skill.id);
-      }
-    }
-    return absorbed;
-  }
-
-  /**
-     * Check if should mutate
-     */
-  shouldMutate() {
-    return Math.random() < this.mutationChance;
-  }
-}
-

src/components/Absorbable.ts

@@ -0,0 +1,87 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Evolution data structure
+ */
+export interface EvolutionData {
+  human: number;
+  beast: number;
+  slime: number;
+}
+
+/**
+ * Skill grant structure
+ */
+export interface SkillGrant {
+  id: string;
+  chance: number;
+}
+
+/**
+ * Component for entities that can be absorbed by the player.
+ */
+export class Absorbable extends Component {
+  evolutionData: EvolutionData;
+  skillsGranted: SkillGrant[];
+  skillAbsorptionChance: number;
+  mutationChance: number;
+  absorbed: boolean;
+
+  constructor() {
+    super(ComponentType.ABSORBABLE);
+    this.evolutionData = {
+      human: 0,
+      beast: 0,
+      slime: 0,
+    };
+    this.skillsGranted = [];
+    this.skillAbsorptionChance = 0.3;
+    this.mutationChance = 0.1;
+    this.absorbed = false;
+  }
+
+  /**
+   * Set evolution data granted upon absorption.
+   * @param human - Human evolution points
+   * @param beast - Beast evolution points
+   * @param slime - Slime evolution points
+   */
+  setEvolutionData(human: number, beast: number, slime: number): void {
+    this.evolutionData = { human, beast, slime };
+  }
+
+  /**
+   * Add a skill that can be granted upon absorption.
+   * @param skillId - The ID of the skill
+   * @param chance - The probability of absorbing this skill (0.0 to 1.0)
+   */
+  addSkill(skillId: string, chance: number | null = null): void {
+    this.skillsGranted.push({
+      id: skillId,
+      chance: chance || this.skillAbsorptionChance,
+    });
+  }
+
+  /**
+   * Calculate which skills are successfully absorbed based on their chances.
+   * @returns Array of successfully absorbed skill IDs
+   */
+  getAbsorbedSkills(): string[] {
+    const absorbed: string[] = [];
+    for (const skill of this.skillsGranted) {
+      if (Math.random() < skill.chance) {
+        absorbed.push(skill.id);
+      }
+    }
+    return absorbed;
+  }
+
+  /**
+   * Determine if a mutation should occur upon absorption.
+   * @returns True if mutation should occur
+   */
+  shouldMutate(): boolean {
+    return Math.random() < this.mutationChance;
+  }
+}

src/components/Camera.ts

@@ -0,0 +1,58 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for camera/viewport management.
+ */
+export class Camera extends Component {
+  x: number;
+  y: number;
+  targetX: number;
+  targetY: number;
+  smoothness: number;
+  bounds: {
+    minX: number;
+    maxX: number;
+    minY: number;
+    maxY: number;
+  };
+  viewportWidth: number;
+  viewportHeight: number;
+
+  constructor(viewportWidth: number, viewportHeight: number, smoothness = 0.15) {
+    super(ComponentType.CAMERA);
+    this.x = 0;
+    this.y = 0;
+    this.targetX = 0;
+    this.targetY = 0;
+    this.smoothness = smoothness;
+    this.viewportWidth = viewportWidth;
+    this.viewportHeight = viewportHeight;
+    this.bounds = {
+      minX: 0,
+      maxX: 0,
+      minY: 0,
+      maxY: 0,
+    };
+  }
+
+  /**
+   * Set camera bounds based on map size.
+   * @param mapWidth - Total map width in pixels
+   * @param mapHeight - Total map height in pixels
+   */
+  setBounds(mapWidth: number, mapHeight: number): void {
+    this.bounds.minX = this.viewportWidth / 2;
+    this.bounds.maxX = mapWidth - this.viewportWidth / 2;
+    this.bounds.minY = this.viewportHeight / 2;
+    this.bounds.maxY = mapHeight - this.viewportHeight / 2;
+  }
+
+  /**
+   * Clamp camera position to bounds.
+   */
+  clampToBounds(): void {
+    this.x = Math.max(this.bounds.minX, Math.min(this.bounds.maxX, this.x));
+    this.y = Math.max(this.bounds.minY, Math.min(this.bounds.maxY, this.y));
+  }
+}

src/components/Combat.js

@@ -1,52 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Combat extends Component {
-  constructor() {
-    super('Combat');
-    this.attackDamage = 10;
-    this.defense = 5;
-    this.attackSpeed = 1.0; // Attacks per second
-    this.attackRange = 50;
-    this.lastAttackTime = 0;
-    this.attackCooldown = 0;
-        
-    // Combat state
-    this.isAttacking = false;
-    this.attackDirection = 0; // Angle in radians
-    this.knockbackResistance = 0.5;
-  }
-
-  /**
-     * Check if can attack
-     */
-  canAttack(currentTime) {
-    return (currentTime - this.lastAttackTime) >= (1.0 / this.attackSpeed);
-  }
-
-  /**
-     * Perform attack
-     */
-  attack(currentTime, direction) {
-    if (!this.canAttack(currentTime)) return false;
-        
-    this.lastAttackTime = currentTime;
-    this.isAttacking = true;
-    this.attackDirection = direction;
-    this.attackCooldown = 0.3; // Attack animation duration
-        
-    return true;
-  }
-
-  /**
-     * Update attack state
-     */
-  update(deltaTime) {
-    if (this.attackCooldown > 0) {
-      this.attackCooldown -= deltaTime;
-      if (this.attackCooldown <= 0) {
-        this.isAttacking = false;
-      }
-    }
-  }
-}
-

src/components/Combat.ts

@@ -0,0 +1,87 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for combat-related properties and actions.
+ */
+export class Combat extends Component {
+  /** The amount of damage dealt by an attack. */
+  attackDamage: number;
+
+  /** The amount of damage reduced from incoming attacks. */
+  defense: number;
+
+  /** The rate of attacks per second. */
+  attackSpeed: number;
+
+  /** The maximum distance an attack can reach. */
+  attackRange: number;
+
+  /** The timestamp of the last successful attack. */
+  lastAttackTime: number;
+
+  /** The remaining duration of the attack animation/cooldown. */
+  attackCooldown: number;
+
+  /** True if the entity is currently in an attack animation/state. */
+  isAttacking: boolean;
+
+  /** The direction of the current attack in radians. */
+  attackDirection: number;
+
+  /** The resistance to knockback effects (0.0 to 1.0). */
+  knockbackResistance: number;
+
+  constructor() {
+    super(ComponentType.COMBAT);
+    this.attackDamage = 10;
+    this.defense = 5;
+    this.attackSpeed = 1.0;
+    this.attackRange = 15;
+    this.lastAttackTime = 0;
+    this.attackCooldown = 0;
+
+    this.isAttacking = false;
+    this.attackDirection = 0;
+    this.knockbackResistance = 0.5;
+  }
+
+  /**
+   * Check if the entity can perform an attack based on its attack speed.
+   * @param currentTime - The current game time in seconds.
+   * @returns True if the attack speed cooldown has elapsed, false otherwise.
+   */
+  canAttack(currentTime: number): boolean {
+    return currentTime - this.lastAttackTime >= 1.0 / this.attackSpeed;
+  }
+
+  /**
+   * Initiate an attack sequence.
+   * @param currentTime - The current game time in seconds.
+   * @param direction - The angle of the attack in radians.
+   * @returns True if the attack was successfully initiated, false if still on cooldown.
+   */
+  attack(currentTime: number, direction: number): boolean {
+    if (!this.canAttack(currentTime)) return false;
+
+    this.lastAttackTime = currentTime;
+    this.isAttacking = true;
+    this.attackDirection = direction;
+    this.attackCooldown = 0.3;
+
+    return true;
+  }
+
+  /**
+   * Update the internal attack state and timers.
+   * @param deltaTime - Time elapsed since last frame in seconds.
+   */
+  update(deltaTime: number): void {
+    if (this.attackCooldown > 0) {
+      this.attackCooldown -= deltaTime;
+      if (this.attackCooldown <= 0) {
+        this.isAttacking = false;
+      }
+    }
+  }
+}

src/components/Evolution.js

@@ -1,105 +0,0 @@
-import { Component } from '../core/Component.js';
-import { GameConfig } from '../GameConfig.js';
-import { Events } from '../core/EventBus.js';
-
-export class Evolution extends Component {
-  constructor() {
-    super('Evolution');
-    this.human = 0;
-    this.beast = 0;
-    this.slime = 100; // Start as pure slime
-
-    // Mutation tracking
-    this.mutations = new Set(); // Use Set for unique functional mutations
-    this.mutationEffects = {
-      electricSkin: false,
-      glowingBody: false,
-      hardenedShell: false
-    };
-  }
-
-  /**
-     * Check and apply functional mutations
-     */
-  checkMutations(stats, engine = null) {
-    if (!stats) return;
-
-    const config = GameConfig.Evolution.thresholds;
-
-    // Threshold-based functional mutations
-    if (stats.constitution > config.hardenedShell.constitution && !this.mutationEffects.hardenedShell) {
-      this.mutationEffects.hardenedShell = true;
-      this.mutations.add('Hardened Shell');
-      if (engine) engine.emit(Events.MUTATION_GAINED, { name: 'Hardened Shell', description: 'Defense Up' });
-      console.log("Mutation Gained: Hardened Shell (Defense Up)");
-    }
-
-    if (stats.intelligence > config.electricSkin.intelligence && !this.mutationEffects.electricSkin) {
-      this.mutationEffects.electricSkin = true;
-      this.mutations.add('Electric Skin');
-      if (engine) engine.emit(Events.MUTATION_GAINED, { name: 'Electric Skin', description: 'Damage Reflection' });
-      console.log("Mutation Gained: Electric Skin (Damage Reflection)");
-    }
-
-    if (this.human > config.glowingBody.human && !this.mutationEffects.glowingBody) {
-      this.mutationEffects.glowingBody = true;
-      this.mutations.add('Bioluminescence');
-      if (engine) engine.emit(Events.MUTATION_GAINED, { name: 'Bioluminescence', description: 'Light Source' });
-      console.log("Mutation Gained: Bioluminescence (Light Source)");
-    }
-  }
-
-  /**
-     * Add evolution points
-     */
-  addEvolution(human = 0, beast = 0, slime = 0) {
-    this.human += human;
-    this.beast += beast;
-    this.slime += slime;
-
-    // Normalize to keep total around target
-    const target = GameConfig.Evolution.totalTarget;
-    const total = this.human + this.beast + this.slime;
-    if (total > target) {
-      const factor = target / total;
-      this.human *= factor;
-      this.beast *= factor;
-      this.slime *= factor;
-    }
-
-    // Ensure no negative values
-    this.human = Math.max(0, this.human);
-    this.beast = Math.max(0, this.beast);
-    this.slime = Math.max(0, this.slime);
-  }
-
-  /**
-     * Get dominant form
-     */
-  getDominantForm() {
-    if (this.human > this.beast && this.human > this.slime) {
-      return 'human';
-    } else if (this.beast > this.human && this.beast > this.slime) {
-      return 'beast';
-    } else {
-      return 'slime';
-    }
-  }
-
-  /**
-     * Get form percentage (0-1)
-     */
-  getFormPercentage(form) {
-    const total = this.human + this.beast + this.slime;
-    if (total === 0) return 0;
-    return this[form] / total;
-  }
-
-  /**
-     * Add a mutation
-     */
-  addMutation(mutation) {
-    this.mutations.push(mutation);
-  }
-}
-

src/components/Evolution.ts

@@ -0,0 +1,140 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+import { GameConfig } from '../GameConfig.ts';
+import { Events } from '../core/EventBus.ts';
+import type { Stats } from './Stats.ts';
+import type { Engine } from '../core/Engine.ts';
+
+/**
+ * Component for tracking evolution and mutations.
+ */
+export class Evolution extends Component {
+  human: number;
+  beast: number;
+  slime: number;
+  mutations: Set<string>;
+  mutationEffects: {
+    electricSkin: boolean;
+    glowingBody: boolean;
+    hardenedShell: boolean;
+  };
+
+  constructor() {
+    super(ComponentType.EVOLUTION);
+    this.human = 0;
+    this.beast = 0;
+    this.slime = 100;
+
+    this.mutations = new Set();
+    this.mutationEffects = {
+      electricSkin: false,
+      glowingBody: false,
+      hardenedShell: false,
+    };
+  }
+
+  /**
+   * Check and apply functional mutations based on stats and evolution levels.
+   * @param stats - The stats component to check against
+   * @param engine - The game engine to emit events
+   */
+  checkMutations(stats: Stats, engine: Engine | null = null): void {
+    if (!stats) return;
+
+    const config = GameConfig.Evolution.thresholds;
+
+    if (
+      stats.constitution > config.hardenedShell.constitution &&
+      !this.mutationEffects.hardenedShell
+    ) {
+      this.mutationEffects.hardenedShell = true;
+      this.mutations.add('Hardened Shell');
+      if (engine)
+        engine.emit(Events.MUTATION_GAINED, { name: 'Hardened Shell', description: 'Defense Up' });
+      console.log('Mutation Gained: Hardened Shell (Defense Up)');
+    }
+
+    if (
+      stats.intelligence > config.electricSkin.intelligence &&
+      !this.mutationEffects.electricSkin
+    ) {
+      this.mutationEffects.electricSkin = true;
+      this.mutations.add('Electric Skin');
+      if (engine)
+        engine.emit(Events.MUTATION_GAINED, {
+          name: 'Electric Skin',
+          description: 'Damage Reflection',
+        });
+      console.log('Mutation Gained: Electric Skin (Damage Reflection)');
+    }
+
+    if (this.human > config.glowingBody.human && !this.mutationEffects.glowingBody) {
+      this.mutationEffects.glowingBody = true;
+      this.mutations.add('Bioluminescence');
+      if (engine)
+        engine.emit(Events.MUTATION_GAINED, {
+          name: 'Bioluminescence',
+          description: 'Light Source',
+        });
+      console.log('Mutation Gained: Bioluminescence (Light Source)');
+    }
+  }
+
+  /**
+   * Add evolution points for different forms.
+   * @param human - Human evolution points
+   * @param beast - Beast evolution points
+   * @param slime - Slime evolution points
+   */
+  addEvolution(human = 0, beast = 0, slime = 0): void {
+    this.human += human;
+    this.beast += beast;
+    this.slime += slime;
+
+    const target = GameConfig.Evolution.totalTarget;
+    const total = this.human + this.beast + this.slime;
+    if (total > target) {
+      const factor = target / total;
+      this.human *= factor;
+      this.beast *= factor;
+      this.slime *= factor;
+    }
+
+    this.human = Math.max(0, this.human);
+    this.beast = Math.max(0, this.beast);
+    this.slime = Math.max(0, this.slime);
+  }
+
+  /**
+   * Determine the current dominant form of the entity.
+   * @returns The name of the dominant form ('human', 'beast', or 'slime')
+   */
+  getDominantForm(): string {
+    if (this.human > this.beast && this.human > this.slime) {
+      return 'human';
+    } else if (this.beast > this.human && this.beast > this.slime) {
+      return 'beast';
+    } else {
+      return 'slime';
+    }
+  }
+
+  /**
+   * Get the percentage of a specific form.
+   * @param form - The form name ('human', 'beast', or 'slime')
+   * @returns The percentage (0.0 to 1.0)
+   */
+  getFormPercentage(form: 'human' | 'beast' | 'slime'): number {
+    const total = this.human + this.beast + this.slime;
+    if (total === 0) return 0;
+    return this[form] / total;
+  }
+
+  /**
+   * Record a new mutation.
+   * @param mutation - The name of the mutation
+   */
+  addMutation(mutation: string): void {
+    this.mutations.add(mutation);
+  }
+}

src/components/Health.js

@@ -1,29 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Health extends Component {
-  constructor(maxHp = 100, hp = null) {
-    super('Health');
-    this.maxHp = maxHp;
-    this.hp = hp !== null ? hp : maxHp;
-    this.regeneration = 2; // HP per second (slime regenerates)
-    this.lastDamageTime = 0;
-    this.invulnerable = false;
-    this.invulnerabilityDuration = 0;
-  }
-
-  takeDamage(amount) {
-    if (this.invulnerable) return 0;
-    this.hp = Math.max(0, this.hp - amount);
-    this.lastDamageTime = Date.now();
-    return amount;
-  }
-
-  heal(amount) {
-    this.hp = Math.min(this.maxHp, this.hp + amount);
-  }
-
-  isDead() {
-    return this.hp <= 0;
-  }
-}
-

src/components/Health.ts

@@ -0,0 +1,57 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for tracking entity health and healing.
+ */
+export class Health extends Component {
+  maxHp: number;
+  hp: number;
+  regeneration: number;
+  lastDamageTime: number;
+  invulnerable: boolean;
+  invulnerabilityDuration: number;
+  isProjectile?: boolean;
+
+  /**
+   * @param maxHp - The maximum health points
+   * @param hp - The current health points (defaults to maxHp)
+   */
+  constructor(maxHp = 100, hp: number | null = null) {
+    super(ComponentType.HEALTH);
+    this.maxHp = maxHp;
+    this.hp = hp !== null ? hp : maxHp;
+    this.regeneration = 2;
+    this.lastDamageTime = 0;
+    this.invulnerable = false;
+    this.invulnerabilityDuration = 0;
+  }
+
+  /**
+   * Reduce health points.
+   * @param amount - The amount of damage to take
+   * @returns The actual damage taken (0 if invulnerable)
+   */
+  takeDamage(amount: number): number {
+    if (this.invulnerable) return 0;
+    this.hp = Math.max(0, this.hp - amount);
+    this.lastDamageTime = Date.now();
+    return amount;
+  }
+
+  /**
+   * Increase health points, capped at maxHp.
+   * @param amount - The amount to heal
+   */
+  heal(amount: number): void {
+    this.hp = Math.min(this.maxHp, this.hp + amount);
+  }
+
+  /**
+   * Check if the entity is dead.
+   * @returns True if hp is 0 or less
+   */
+  isDead(): boolean {
+    return this.hp <= 0;
+  }
+}

src/components/Intent.ts

@@ -0,0 +1,39 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component to track intended actions (Skills, Attacks, Interactions).
+ * This decouples input from execution.
+ */
+export class Intent extends Component {
+  action: string | null;
+  data: Record<string, unknown>;
+
+  /**
+   * @param action - The initial intended action
+   * @param data - Additional data for the action
+   */
+  constructor(action: string | null = null, data: Record<string, unknown> = {}) {
+    super(ComponentType.INTENT);
+    this.action = action;
+    this.data = data;
+  }
+
+  /**
+   * Set a new intended action.
+   * @param action - The action name (e.g., 'skill_use', 'attack')
+   * @param data - Additional data for the action
+   */
+  setIntent(action: string, data: Record<string, unknown> = {}): void {
+    this.action = action;
+    this.data = data;
+  }
+
+  /**
+   * Clear the current intent.
+   */
+  clear(): void {
+    this.action = null;
+    this.data = {};
+  }
+}

src/components/Inventory.js

@@ -1,71 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Inventory extends Component {
-  constructor() {
-    super('Inventory');
-    this.items = []; // Array of item objects
-    this.maxSize = 20;
-    this.equipped = {
-      weapon: null,
-      armor: null,
-      accessory: null
-    };
-  }
-
-  /**
-     * Add an item to inventory
-     */
-  addItem(item) {
-    if (this.items.length < this.maxSize) {
-      this.items.push(item);
-      return true;
-    }
-    return false;
-  }
-
-  /**
-     * Remove an item
-     */
-  removeItem(itemId) {
-    const index = this.items.findIndex(item => item.id === itemId);
-    if (index > -1) {
-      return this.items.splice(index, 1)[0];
-    }
-    return null;
-  }
-
-  /**
-     * Equip an item
-     */
-  equipItem(itemId, slot) {
-    const item = this.items.find(i => i.id === itemId);
-    if (!item) return false;
-        
-    // Unequip current item in slot
-    if (this.equipped[slot]) {
-      this.items.push(this.equipped[slot]);
-    }
-        
-    // Equip new item
-    this.equipped[slot] = item;
-    const index = this.items.indexOf(item);
-    if (index > -1) {
-      this.items.splice(index, 1);
-    }
-        
-    return true;
-  }
-
-  /**
-     * Unequip an item
-     */
-  unequipItem(slot) {
-    if (this.equipped[slot]) {
-      this.items.push(this.equipped[slot]);
-      this.equipped[slot] = null;
-      return true;
-    }
-    return false;
-  }
-}
-

src/components/Inventory.ts

@@ -0,0 +1,97 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+import type { Item } from '../items/Item.ts';
+
+/**
+ * Equipment slots structure
+ */
+export interface Equipment {
+  weapon: Item | null;
+  armor: Item | null;
+  accessory: Item | null;
+}
+
+/**
+ * Component for managing an entity's items and equipment.
+ */
+export class Inventory extends Component {
+  items: Item[];
+  maxSize: number;
+  equipped: Equipment;
+
+  constructor() {
+    super(ComponentType.INVENTORY);
+    this.items = [];
+    this.maxSize = 20;
+    this.equipped = {
+      weapon: null,
+      armor: null,
+      accessory: null,
+    };
+  }
+
+  /**
+   * Add an item to the inventory.
+   * @param item - The item to add
+   * @returns True if the item was added, false if inventory is full
+   */
+  addItem(item: Item): boolean {
+    if (this.items.length < this.maxSize) {
+      this.items.push(item);
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * Remove an item from the inventory.
+   * @param itemId - The ID of the item to remove
+   * @returns The removed item, or null if not found
+   */
+  removeItem(itemId: string): Item | null {
+    const index = this.items.findIndex((item) => item.id === itemId);
+    if (index > -1) {
+      return this.items.splice(index, 1)[0];
+    }
+    return null;
+  }
+
+  /**
+   * Equip an item from the inventory into a specific slot.
+   * @param itemId - The ID of the item to equip
+   * @param slot - The equipment slot
+   * @returns True if the item was successfully equipped
+   */
+  equipItem(itemId: string, slot: keyof Equipment): boolean {
+    const item = this.items.find((i) => i.id === itemId);
+    if (!item) return false;
+
+    const currentItem = this.equipped[slot];
+    if (currentItem) {
+      this.items.push(currentItem);
+    }
+
+    this.equipped[slot] = item;
+    const index = this.items.indexOf(item);
+    if (index > -1) {
+      this.items.splice(index, 1);
+    }
+
+    return true;
+  }
+
+  /**
+   * Unequip an item from a slot and return it to the inventory.
+   * @param slot - The equipment slot to clear
+   * @returns True if an item was unequipped
+   */
+  unequipItem(slot: keyof Equipment): boolean {
+    const item = this.equipped[slot];
+    if (item) {
+      this.items.push(item);
+      this.equipped[slot] = null;
+      return true;
+    }
+    return false;
+  }
+}

src/components/Music.ts

@@ -0,0 +1,234 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+import type { Sequence } from '../core/Music.ts';
+
+/**
+ * Component for managing background music and sound effects.
+ */
+export class Music extends Component {
+  sequences: Map<string, Sequence>;
+  currentSequence: Sequence | null;
+  activeSequences: Set<Sequence>;
+  volume: number;
+  enabled: boolean;
+  private sequenceChain: string[];
+  private currentChainIndex: number;
+  private sequenceVolumes: Map<Sequence, number>;
+
+  constructor() {
+    super(ComponentType.MUSIC);
+    this.sequences = new Map();
+    this.currentSequence = null;
+    this.activeSequences = new Set();
+    this.volume = 0.5;
+    this.enabled = true;
+    this.sequenceChain = [];
+    this.currentChainIndex = 0;
+    this.sequenceVolumes = new Map();
+  }
+
+  /**
+   * Add a music sequence.
+   * @param name - Unique identifier for the sequence
+   * @param sequence - The sequence instance
+   */
+  addSequence(name: string, sequence: Sequence): void {
+    this.sequences.set(name, sequence);
+    if (sequence.gain) {
+      sequence.gain.gain.value = this.volume;
+    }
+  }
+
+  /**
+   * Play a sequence by name.
+   * @param name - The sequence identifier
+   */
+  playSequence(name: string): void {
+    if (!this.enabled) return;
+
+    const sequence = this.sequences.get(name);
+    if (sequence) {
+      this.stop();
+      this.currentSequence = sequence;
+      if (sequence.gain) {
+        sequence.gain.gain.value = this.volume;
+      }
+      sequence.play();
+    }
+  }
+
+  /**
+   * Play multiple sequences simultaneously (polyphony).
+   * @param sequenceConfigs - Array of configs with name, optional delay in beats, and optional loop
+   */
+  playSequences(sequenceConfigs: Array<{ name: string; delay?: number; loop?: boolean }>): void {
+    if (!this.enabled || sequenceConfigs.length === 0) return;
+
+    const firstSeq = this.sequences.get(sequenceConfigs[0].name);
+    if (!firstSeq || !firstSeq.ac) return;
+
+    const ac = firstSeq.ac;
+    const when = ac.currentTime;
+    const tempo = firstSeq.tempo || 120;
+
+    sequenceConfigs.forEach((config) => {
+      const sequence = this.sequences.get(config.name);
+      if (!sequence) return;
+
+      if (config.loop !== undefined) {
+        sequence.loop = config.loop;
+      }
+      if (sequence.gain) {
+        sequence.gain.gain.value = this.volume;
+      }
+
+      const delaySeconds = config.delay ? (60 / tempo) * config.delay : 0;
+      sequence.play(when + delaySeconds);
+      this.activeSequences.add(sequence);
+
+      if (!this.currentSequence) {
+        this.currentSequence = sequence;
+      }
+    });
+  }
+
+  /**
+   * Chain multiple sequences together in order (sequential playback).
+   * @param sequenceNames - Array of sequence names to play in order
+   */
+  chainSequences(sequenceNames: string[]): void {
+    if (!this.enabled || sequenceNames.length === 0) return;
+
+    this.stop();
+    this.sequenceChain = sequenceNames;
+    this.currentChainIndex = 0;
+
+    this.playNextInChain();
+  }
+
+  /**
+   * Play the next sequence in the chain.
+   */
+  private playNextInChain(): void {
+    if (!this.enabled || this.sequenceChain.length === 0) return;
+
+    const seqName = this.sequenceChain[this.currentChainIndex];
+    const sequence = this.sequences.get(seqName);
+    if (!sequence) return;
+
+    this.currentSequence = sequence;
+    sequence.loop = false;
+    if (sequence.gain) {
+      sequence.gain.gain.value = this.volume;
+    }
+
+    sequence.play();
+    if (sequence.osc) {
+      const nextIndex = (this.currentChainIndex + 1) % this.sequenceChain.length;
+      sequence.osc.onended = () => {
+        if (this.enabled) {
+          this.currentChainIndex = nextIndex;
+          this.playNextInChain();
+        }
+      };
+    }
+  }
+
+  /**
+   * Stop current playback.
+   */
+  stop(): void {
+    this.activeSequences.forEach((seq) => {
+      seq.stop();
+    });
+    this.activeSequences.clear();
+    if (this.currentSequence) {
+      this.currentSequence.stop();
+      this.currentSequence = null;
+    }
+  }
+
+  /**
+   * Set the volume (0.0 to 1.0).
+   * @param volume - Volume level
+   */
+  setVolume(volume: number): void {
+    this.volume = Math.max(0, Math.min(1, volume));
+    if (this.currentSequence && this.currentSequence.gain) {
+      this.currentSequence.gain.gain.value = this.volume;
+    }
+    this.sequences.forEach((seq) => {
+      if (seq.gain) {
+        seq.gain.gain.value = this.volume;
+      }
+    });
+  }
+
+  /**
+   * Enable or disable music playback.
+   * @param enabled - Whether music should be enabled
+   */
+  setEnabled(enabled: boolean): void {
+    this.enabled = enabled;
+    if (!enabled) {
+      this.stop();
+    }
+  }
+
+  /**
+   * Pause all active sequences by setting their gain to 0.
+   */
+  pause(): void {
+    this.activeSequences.forEach((seq) => {
+      if (seq.gain) {
+        const currentVolume = seq.gain.gain.value;
+        this.sequenceVolumes.set(seq, currentVolume);
+        seq.gain.gain.value = 0;
+      }
+    });
+    if (this.currentSequence && this.currentSequence.gain) {
+      const currentVolume = this.currentSequence.gain.gain.value;
+      this.sequenceVolumes.set(this.currentSequence, currentVolume);
+      this.currentSequence.gain.gain.value = 0;
+    }
+    this.sequences.forEach((seq) => {
+      if (seq.gain && seq.gain.gain.value > 0) {
+        const currentVolume = seq.gain.gain.value;
+        this.sequenceVolumes.set(seq, currentVolume);
+        seq.gain.gain.value = 0;
+      }
+    });
+  }
+
+  /**
+   * Resume all active sequences by restoring their volume.
+   */
+  resume(): void {
+    this.activeSequences.forEach((seq) => {
+      if (seq.gain) {
+        const savedVolume = this.sequenceVolumes.get(seq);
+        if (savedVolume !== undefined) {
+          seq.gain.gain.value = savedVolume;
+        } else {
+          seq.gain.gain.value = this.volume;
+        }
+      }
+    });
+    if (this.currentSequence && this.currentSequence.gain) {
+      const savedVolume = this.sequenceVolumes.get(this.currentSequence);
+      if (savedVolume !== undefined) {
+        this.currentSequence.gain.gain.value = savedVolume;
+      } else {
+        this.currentSequence.gain.gain.value = this.volume;
+      }
+    }
+    this.sequences.forEach((seq) => {
+      if (seq.gain) {
+        const savedVolume = this.sequenceVolumes.get(seq);
+        if (savedVolume !== undefined) {
+          seq.gain.gain.value = savedVolume;
+        }
+      }
+    });
+  }
+}

src/components/Position.js

@@ -1,11 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Position extends Component {
-  constructor(x = 0, y = 0, rotation = 0) {
-    super('Position');
-    this.x = x;
-    this.y = y;
-    this.rotation = rotation;
-  }
-}
-

src/components/Position.ts

@@ -0,0 +1,23 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for tracking entity position and rotation in the game world.
+ */
+export class Position extends Component {
+  x: number;
+  y: number;
+  rotation: number;
+
+  /**
+   * @param x - The X-coordinate
+   * @param y - The Y-coordinate
+   * @param rotation - The rotation in radians
+   */
+  constructor(x = 0, y = 0, rotation = 0) {
+    super(ComponentType.POSITION);
+    this.x = x;
+    this.y = y;
+    this.rotation = rotation;
+  }
+}

src/components/SkillProgress.js

@@ -1,45 +0,0 @@
-import { Component } from '../core/Component.js';
-
-/**
- * Tracks progress toward learning skills
- * Need to absorb multiple enemies with the same skill to learn it
- */
-export class SkillProgress extends Component {
-  constructor() {
-    super('SkillProgress');
-    this.skillProgress = new Map(); // skillId -> count (how many times absorbed)
-    this.requiredAbsorptions = 5; // Need to absorb 5 enemies with a skill to learn it
-  }
-
-  /**
-     * Add progress toward learning a skill
-     */
-  addSkillProgress(skillId) {
-    const current = this.skillProgress.get(skillId) || 0;
-    this.skillProgress.set(skillId, current + 1);
-    return this.skillProgress.get(skillId);
-  }
-
-  /**
-     * Check if skill can be learned
-     */
-  canLearnSkill(skillId) {
-    const progress = this.skillProgress.get(skillId) || 0;
-    return progress >= this.requiredAbsorptions;
-  }
-
-  /**
-     * Get progress for a skill
-     */
-  getSkillProgress(skillId) {
-    return this.skillProgress.get(skillId) || 0;
-  }
-
-  /**
-     * Get all skill progress
-     */
-  getAllProgress() {
-    return this.skillProgress;
-  }
-}
-

src/components/SkillProgress.ts

@@ -0,0 +1,56 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Tracks progress toward learning skills.
+ * Need to absorb multiple enemies with the same skill to learn it.
+ */
+export class SkillProgress extends Component {
+  skillProgress: Map<string, number>;
+  requiredAbsorptions: number;
+
+  constructor() {
+    super(ComponentType.SKILL_PROGRESS);
+    this.skillProgress = new Map();
+    this.requiredAbsorptions = 5;
+  }
+
+  /**
+   * Add progress toward learning a skill.
+   * @param skillId - The ID of the skill
+   * @returns The current absorption count for this skill
+   */
+  addSkillProgress(skillId: string): number {
+    const current = this.skillProgress.get(skillId) || 0;
+    const newValue = current + 1;
+    this.skillProgress.set(skillId, newValue);
+    return newValue;
+  }
+
+  /**
+   * Check if a skill has been absorbed enough times to be learned.
+   * @param skillId - The ID of the skill
+   * @returns True if progress is greater than or equal to requirements
+   */
+  canLearnSkill(skillId: string): boolean {
+    const progress = this.skillProgress.get(skillId) || 0;
+    return progress >= this.requiredAbsorptions;
+  }
+
+  /**
+   * Get the current absorption count for a specific skill.
+   * @param skillId - The ID of the skill
+   * @returns The current progress count
+   */
+  getSkillProgress(skillId: string): number {
+    return this.skillProgress.get(skillId) || 0;
+  }
+
+  /**
+   * Get the entire skill progress map.
+   * @returns The progress map
+   */
+  getAllProgress(): Map<string, number> {
+    return this.skillProgress;
+  }
+}

src/components/Skills.js

@@ -1,69 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Skills extends Component {
-  constructor() {
-    super('Skills');
-    this.activeSkills = []; // Array of skill IDs
-    this.passiveSkills = []; // Array of passive skill IDs
-    this.skillCooldowns = new Map(); // skillId -> remaining cooldown time
-  }
-
-  /**
-     * Add a skill
-     */
-  addSkill(skillId, isPassive = false) {
-    if (isPassive) {
-      if (!this.passiveSkills.includes(skillId)) {
-        this.passiveSkills.push(skillId);
-      }
-    } else {
-      if (!this.activeSkills.includes(skillId)) {
-        this.activeSkills.push(skillId);
-      }
-    }
-  }
-
-  /**
-     * Check if entity has a skill
-     */
-  hasSkill(skillId) {
-    return this.activeSkills.includes(skillId) || 
-               this.passiveSkills.includes(skillId);
-  }
-
-  /**
-     * Set skill cooldown
-     */
-  setCooldown(skillId, duration) {
-    this.skillCooldowns.set(skillId, duration);
-  }
-
-  /**
-     * Update cooldowns
-     */
-  updateCooldowns(deltaTime) {
-    for (const [skillId, cooldown] of this.skillCooldowns.entries()) {
-      const newCooldown = cooldown - deltaTime;
-      if (newCooldown <= 0) {
-        this.skillCooldowns.delete(skillId);
-      } else {
-        this.skillCooldowns.set(skillId, newCooldown);
-      }
-    }
-  }
-
-  /**
-     * Check if skill is on cooldown
-     */
-  isOnCooldown(skillId) {
-    return this.skillCooldowns.has(skillId);
-  }
-
-  /**
-     * Get remaining cooldown
-     */
-  getCooldown(skillId) {
-    return this.skillCooldowns.get(skillId) || 0;
-  }
-}
-

src/components/Skills.ts

@@ -0,0 +1,86 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for managing an entity's active and passive skills.
+ */
+export class Skills extends Component {
+  activeSkills: string[];
+  passiveSkills: string[];
+  skillCooldowns: Map<string, number>;
+
+  constructor() {
+    super(ComponentType.SKILLS);
+    this.activeSkills = [];
+    this.passiveSkills = [];
+    this.skillCooldowns = new Map();
+  }
+
+  /**
+   * Add a skill to the entity.
+   * @param skillId - The ID of the skill to add
+   * @param isPassive - Whether the skill is passive
+   */
+  addSkill(skillId: string, isPassive = false): void {
+    if (isPassive) {
+      if (!this.passiveSkills.includes(skillId)) {
+        this.passiveSkills.push(skillId);
+      }
+    } else {
+      if (!this.activeSkills.includes(skillId)) {
+        this.activeSkills.push(skillId);
+      }
+    }
+  }
+
+  /**
+   * Check if the entity has a specific skill.
+   * @param skillId - The ID of the skill to check
+   * @returns True if the entity has the skill (active or passive)
+   */
+  hasSkill(skillId: string): boolean {
+    return this.activeSkills.includes(skillId) || this.passiveSkills.includes(skillId);
+  }
+
+  /**
+   * Set the remaining cooldown duration for a skill.
+   * @param skillId - The ID of the skill
+   * @param duration - The cooldown duration in seconds
+   */
+  setCooldown(skillId: string, duration: number): void {
+    this.skillCooldowns.set(skillId, duration);
+  }
+
+  /**
+   * Update all active cooldowns.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   */
+  updateCooldowns(deltaTime: number): void {
+    for (const [skillId, cooldown] of this.skillCooldowns.entries()) {
+      const newCooldown = cooldown - deltaTime;
+      if (newCooldown <= 0) {
+        this.skillCooldowns.delete(skillId);
+      } else {
+        this.skillCooldowns.set(skillId, newCooldown);
+      }
+    }
+  }
+
+  /**
+   * Check if a skill is currently on cooldown.
+   * @param skillId - The ID of the skill
+   * @returns True if the skill is on cooldown
+   */
+  isOnCooldown(skillId: string): boolean {
+    return this.skillCooldowns.has(skillId);
+  }
+
+  /**
+   * Get the remaining cooldown duration for a skill.
+   * @param skillId - The ID of the skill
+   * @returns The remaining cooldown in seconds, or 0 if not on cooldown
+   */
+  getCooldown(skillId: string): number {
+    return this.skillCooldowns.get(skillId) || 0;
+  }
+}

src/components/SoundEffects.ts

@@ -0,0 +1,73 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+import type { Sequence } from '../core/Music.ts';
+
+/**
+ * Component for managing sound effects.
+ * Sound effects are short, one-shot audio sequences.
+ */
+export class SoundEffects extends Component {
+  sounds: Map<string, Sequence>;
+  volume: number;
+  enabled: boolean;
+  audioContext: AudioContext | null;
+
+  constructor(audioContext?: AudioContext) {
+    super(ComponentType.SOUND_EFFECTS);
+    this.sounds = new Map();
+    this.volume = 0.15; // Reduced default volume
+    this.enabled = true;
+    this.audioContext = audioContext || null;
+  }
+
+  /**
+   * Add a sound effect sequence.
+   * @param name - Unique identifier for the sound
+   * @param sequence - The sequence instance (should be short, non-looping)
+   */
+  addSound(name: string, sequence: Sequence): void {
+    sequence.loop = false; // SFX should never loop
+    this.sounds.set(name, sequence);
+    if (sequence.gain) {
+      sequence.gain.gain.value = this.volume;
+    }
+  }
+
+  /**
+   * Play a sound effect by name.
+   * @param name - The sound identifier
+   */
+  play(name: string): void {
+    if (!this.enabled) return;
+
+    const sound = this.sounds.get(name);
+    if (sound) {
+      sound.stop();
+      if (sound.gain) {
+        sound.gain.gain.value = this.volume;
+      }
+      sound.play();
+    }
+  }
+
+  /**
+   * Set the volume (0.0 to 1.0).
+   * @param volume - Volume level
+   */
+  setVolume(volume: number): void {
+    this.volume = Math.max(0, Math.min(1, volume));
+    this.sounds.forEach((seq) => {
+      if (seq.gain) {
+        seq.gain.gain.value = this.volume;
+      }
+    });
+  }
+
+  /**
+   * Enable or disable sound effects.
+   * @param enabled - Whether sound effects should be enabled
+   */
+  setEnabled(enabled: boolean): void {
+    this.enabled = enabled;
+  }
+}

src/components/Sprite.js

@@ -1,18 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Sprite extends Component {
-  constructor(color = '#00ff96', width = 30, height = 30, shape = 'circle') {
-    super('Sprite');
-    this.color = color;
-    this.width = width;
-    this.height = height;
-    this.shape = shape; // 'circle', 'rect', 'slime'
-    this.alpha = 1.0;
-    this.scale = 1.0;
-        
-    // Animation properties
-    this.animationTime = 0;
-    this.morphAmount = 0; // For slime morphing
-  }
-}
-

src/components/Sprite.ts

@@ -0,0 +1,43 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+import { EntityType } from '../core/Constants.ts';
+import { AnimationState } from '../core/Constants.ts';
+
+/**
+ * Component for entity visual representation and animation.
+ */
+export class Sprite extends Component {
+  color: string;
+  width: number;
+  height: number;
+  shape: string | EntityType;
+  alpha: number;
+  scale: number;
+  animationTime: number;
+  animationState: string | AnimationState;
+  animationSpeed: number;
+  morphAmount: number;
+  yOffset: number;
+
+  /**
+   * @param color - The CSS color or hex code
+   * @param width - The width of the sprite
+   * @param height - The height of the sprite
+   * @param shape - The shape type ('circle', 'rect', 'slime', or EntityType)
+   */
+  constructor(color = '#00ff96', width = 30, height = 30, shape: string | EntityType = 'circle') {
+    super(ComponentType.SPRITE);
+    this.color = color;
+    this.width = width;
+    this.height = height;
+    this.shape = shape;
+    this.alpha = 1.0;
+    this.scale = 1.0;
+
+    this.animationTime = 0;
+    this.animationState = AnimationState.IDLE;
+    this.animationSpeed = 4;
+    this.morphAmount = 0;
+    this.yOffset = 0;
+  }
+}

src/components/Stats.js

@@ -1,55 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Stats extends Component {
-  constructor() {
-    super('Stats');
-    this.strength = 10;      // Physical damage
-    this.agility = 10;       // Movement speed, attack speed
-    this.intelligence = 10; // Magic damage, skill effectiveness
-    this.constitution = 10;  // Max HP, defense
-    this.perception = 10;    // Detection range, stealth detection
-        
-    // Derived stats
-    this.level = 1;
-    this.experience = 0;
-    this.experienceToNext = 100;
-  }
-
-  /**
-     * Add experience and handle level ups
-     */
-  addExperience(amount) {
-    this.experience += amount;
-    let leveledUp = false;
-        
-    while (this.experience >= this.experienceToNext) {
-      this.experience -= this.experienceToNext;
-      this.levelUp();
-      leveledUp = true;
-    }
-        
-    return leveledUp;
-  }
-
-  /**
-     * Level up - increase stats
-     */
-  levelUp() {
-    this.level++;
-    this.strength += 2;
-    this.agility += 2;
-    this.intelligence += 2;
-    this.constitution += 2;
-    this.perception += 2;
-    this.experienceToNext = Math.floor(this.experienceToNext * 1.5);
-  }
-
-  /**
-     * Get total stat points
-     */
-  getTotalStats() {
-    return this.strength + this.agility + this.intelligence + 
-               this.constitution + this.perception;
-  }
-}
-

src/components/Stats.ts

@@ -0,0 +1,68 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for entity base attributes and leveling.
+ */
+export class Stats extends Component {
+  strength: number;
+  agility: number;
+  intelligence: number;
+  constitution: number;
+  perception: number;
+  level: number;
+  experience: number;
+  experienceToNext: number;
+
+  constructor() {
+    super(ComponentType.STATS);
+    this.strength = 10;
+    this.agility = 10;
+    this.intelligence = 10;
+    this.constitution = 10;
+    this.perception = 10;
+
+    this.level = 1;
+    this.experience = 0;
+    this.experienceToNext = 100;
+  }
+
+  /**
+   * Add experience points and level up if threshold is reached.
+   * @param amount - The amount of experience to add
+   * @returns True if the entity leveled up
+   */
+  addExperience(amount: number): boolean {
+    this.experience += amount;
+    let leveledUp = false;
+
+    while (this.experience >= this.experienceToNext) {
+      this.experience -= this.experienceToNext;
+      this.levelUp();
+      leveledUp = true;
+    }
+
+    return leveledUp;
+  }
+
+  /**
+   * Increase level and all base attributes.
+   */
+  levelUp(): void {
+    this.level++;
+    this.strength += 2;
+    this.agility += 2;
+    this.intelligence += 2;
+    this.constitution += 2;
+    this.perception += 2;
+    this.experienceToNext = Math.floor(this.experienceToNext * 1.5);
+  }
+
+  /**
+   * Calculate the sum of all base attributes.
+   * @returns The total attribute points
+   */
+  getTotalStats(): number {
+    return this.strength + this.agility + this.intelligence + this.constitution + this.perception;
+  }
+}

src/components/Stealth.js

@@ -1,48 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Stealth extends Component {
-  constructor() {
-    super('Stealth');
-    this.visibility = 1.0; // 0 = fully hidden, 1 = fully visible
-    this.stealthType = 'slime'; // 'slime', 'beast', 'human'
-    this.isStealthed = false;
-    this.stealthLevel = 0; // 0-100
-    this.detectionRadius = 100; // How far others can detect this entity
-  }
-
-  /**
-     * Enter stealth mode
-     */
-  enterStealth(type) {
-    this.stealthType = type;
-    this.isStealthed = true;
-    this.visibility = 0.3;
-  }
-
-  /**
-     * Exit stealth mode
-     */
-  exitStealth() {
-    this.isStealthed = false;
-    this.visibility = 1.0;
-  }
-
-  /**
-     * Update stealth based on movement and actions
-     */
-  updateStealth(isMoving, isInCombat) {
-    if (isInCombat) {
-      this.exitStealth();
-      return;
-    }
-
-    if (this.isStealthed) {
-      if (isMoving) {
-        this.visibility = Math.min(1.0, this.visibility + 0.1);
-      } else {
-        this.visibility = Math.max(0.1, this.visibility - 0.05);
-      }
-    }
-  }
-}
-

src/components/Stealth.ts

@@ -0,0 +1,80 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for managing entity visibility and stealth mechanics.
+ */
+export class Stealth extends Component {
+  visibility: number;
+  stealthType: string;
+  isStealthed: boolean;
+  stealthLevel: number;
+  detectionRadius: number;
+  camouflageColor: string | null;
+  baseColor: string | null;
+  sizeMultiplier: number;
+  formAppearance: string | null;
+
+  constructor() {
+    super(ComponentType.STEALTH);
+    this.visibility = 1.0;
+    this.stealthType = 'slime';
+    this.isStealthed = false;
+    this.stealthLevel = 0;
+    this.detectionRadius = 100;
+    this.camouflageColor = null;
+    this.baseColor = null;
+    this.sizeMultiplier = 1.0;
+    this.formAppearance = null;
+  }
+
+  /**
+   * Enter stealth mode.
+   * @param type - The type of stealth (e.g., 'slime', 'human')
+   * @param baseColor - Original entity color to restore later
+   */
+  enterStealth(type: string, baseColor?: string): void {
+    this.stealthType = type;
+    this.isStealthed = true;
+    this.visibility = 0.3;
+    if (baseColor) {
+      this.baseColor = baseColor;
+    }
+    if (type === 'slime') {
+      this.sizeMultiplier = 0.6;
+    } else {
+      this.sizeMultiplier = 1.0;
+    }
+  }
+
+  /**
+   * Exit stealth mode and restore full visibility.
+   */
+  exitStealth(): void {
+    this.isStealthed = false;
+    this.visibility = 1.0;
+    this.camouflageColor = null;
+    this.sizeMultiplier = 1.0;
+    this.formAppearance = null;
+  }
+
+  /**
+   * Update visibility levels based on movement and combat state.
+   * @param isMoving - Whether the entity is currently moving
+   * @param isInCombat - Whether the entity is currently in combat
+   */
+  updateStealth(isMoving: boolean, isInCombat: boolean): void {
+    if (isInCombat) {
+      this.exitStealth();
+      return;
+    }
+
+    if (this.isStealthed) {
+      if (isMoving) {
+        this.visibility = Math.min(1.0, this.visibility + 0.1);
+      } else {
+        this.visibility = Math.max(0.1, this.visibility - 0.05);
+      }
+    }
+  }
+}

src/components/Velocity.js

@@ -1,11 +0,0 @@
-import { Component } from '../core/Component.js';
-
-export class Velocity extends Component {
-  constructor(vx = 0, vy = 0) {
-    super('Velocity');
-    this.vx = vx;
-    this.vy = vy;
-    this.maxSpeed = 200;
-  }
-}
-

src/components/Velocity.ts

@@ -0,0 +1,26 @@
+import { Component } from '../core/Component.ts';
+import { ComponentType } from '../core/Constants.ts';
+
+/**
+ * Component for tracking entity velocity and movement speed limits.
+ */
+export class Velocity extends Component {
+  vx: number;
+  vy: number;
+  maxSpeed: number;
+  isLocked: boolean;
+  lockTimer: number;
+
+  /**
+   * @param vx - Initial X velocity
+   * @param vy - Initial Y velocity
+   */
+  constructor(vx = 0, vy = 0) {
+    super(ComponentType.VELOCITY);
+    this.vx = vx;
+    this.vy = vy;
+    this.maxSpeed = 200;
+    this.isLocked = false;
+    this.lockTimer = 0;
+  }
+}

src/config/MusicConfig.ts

@@ -0,0 +1,156 @@
+import { Sequence } from '../core/Music.ts';
+import type { Music } from '../components/Music.ts';
+import type { MusicSystem } from '../systems/MusicSystem.ts';
+
+/**
+ * Configure and setup background music.
+ * @param music - Music component instance
+ * @param audioCtx - AudioContext instance
+ */
+export function setupMusic(music: Music, audioCtx: AudioContext): void {
+  const tempo = 132;
+
+  const lead = new Sequence(audioCtx, tempo, [
+    'F4 e',
+    'Ab4 e',
+    'C5 e',
+    'F5 e',
+    'C5 e',
+    'Ab4 e',
+    'F4 e',
+    'C4 e',
+    'F4 e',
+    'Ab4 e',
+    'C5 e',
+    'F5 e',
+    'C5 e',
+    'Ab4 e',
+    'F4 e',
+    'C4 e',
+    'G4 e',
+    'Bb4 e',
+    'D5 e',
+    'G5 e',
+    'D5 e',
+    'Bb4 e',
+    'G4 e',
+    'D4 e',
+    'F4 e',
+    'Ab4 e',
+    'C5 e',
+    'F5 e',
+    'C5 e',
+    'Ab4 e',
+    'F4 e',
+    'C4 e',
+  ]);
+  lead.staccato = 0.1;
+  lead.smoothing = 0.3;
+  lead.waveType = 'triangle';
+  lead.loop = true;
+  if (lead.gain) {
+    lead.gain.gain.value = 0.8;
+  }
+  music.addSequence('lead', lead);
+
+  const harmony = new Sequence(audioCtx, tempo, [
+    'C4 e',
+    'Eb4 e',
+    'F4 e',
+    'Ab4 e',
+    'F4 e',
+    'Eb4 e',
+    'C4 e',
+    'Ab3 e',
+    'C4 e',
+    'Eb4 e',
+    'F4 e',
+    'Ab4 e',
+    'F4 e',
+    'Eb4 e',
+    'C4 e',
+    'Ab3 e',
+    'D4 e',
+    'F4 e',
+    'G4 e',
+    'Bb4 e',
+    'G4 e',
+    'F4 e',
+    'D4 e',
+    'Bb3 e',
+    'C4 e',
+    'Eb4 e',
+    'F4 e',
+    'Ab4 e',
+    'F4 e',
+    'Eb4 e',
+    'C4 e',
+    'Ab3 e',
+  ]);
+  harmony.staccato = 0.15;
+  harmony.smoothing = 0.4;
+  harmony.waveType = 'triangle';
+  harmony.loop = true;
+  if (harmony.gain) {
+    harmony.gain.gain.value = 0.6;
+  }
+  music.addSequence('harmony', harmony);
+
+  const bass = new Sequence(audioCtx, tempo, [
+    'F2 q',
+    'C3 q',
+    'F2 q',
+    'C3 q',
+    'G2 q',
+    'D3 q',
+    'G2 q',
+    'D3 q',
+    'F2 q',
+    'C3 q',
+    'F2 q',
+    'C3 q',
+  ]);
+  bass.staccato = 0.05;
+  bass.smoothing = 0.5;
+  bass.waveType = 'triangle';
+  bass.loop = true;
+  if (bass.gain) {
+    bass.gain.gain.value = 0.7;
+  }
+  if (bass.bass) {
+    bass.bass.gain.value = 4;
+    bass.bass.frequency.value = 80;
+  }
+  music.addSequence('bass', bass);
+
+  music.playSequences([
+    { name: 'lead', loop: true },
+    { name: 'harmony', loop: true },
+    { name: 'bass', loop: true },
+  ]);
+  music.setVolume(0.02);
+}
+
+/**
+ * Setup music event handlers for canvas interaction.
+ * @param music - Music component instance
+ * @param musicSystem - MusicSystem instance
+ * @param canvas - Canvas element
+ */
+export function setupMusicHandlers(
+  music: Music,
+  musicSystem: MusicSystem,
+  canvas: HTMLCanvasElement
+): void {
+  canvas.addEventListener('click', () => {
+    musicSystem.resumeAudioContext();
+    if (music.enabled && music.activeSequences.size === 0) {
+      music.playSequences([
+        { name: 'lead', loop: true },
+        { name: 'harmony', loop: true },
+        { name: 'bass', loop: true },
+      ]);
+    }
+    canvas.focus();
+  });
+}

src/config/SFXConfig.ts

@@ -0,0 +1,35 @@
+import { Sequence } from '../core/Music.ts';
+import type { SoundEffects } from '../components/SoundEffects.ts';
+
+/**
+ * Configure and setup sound effects.
+ * @param sfx - SoundEffects component instance
+ * @param ac - AudioContext instance
+ */
+export function setupSFX(sfx: SoundEffects, ac: AudioContext): void {
+  const attackSound = new Sequence(ac, 120, ['C5 s']);
+  attackSound.staccato = 0.8;
+  sfx.addSound('attack', attackSound);
+
+  const absorbSound = new Sequence(ac, 120, ['G4 e']);
+  absorbSound.staccato = 0.5;
+  sfx.addSound('absorb', absorbSound);
+
+  const skillSound = new Sequence(ac, 120, ['A4 e']);
+  skillSound.staccato = 0.6;
+  sfx.addSound('skill', skillSound);
+
+  const damageSound = new Sequence(ac, 120, ['F4 s']);
+  damageSound.staccato = 0.8;
+  sfx.addSound('damage', damageSound);
+
+  const shootSound = new Sequence(ac, 120, ['C5 s']);
+  shootSound.staccato = 0.9;
+  sfx.addSound('shoot', shootSound);
+
+  const impactSound = new Sequence(ac, 120, ['G4 s']);
+  impactSound.staccato = 0.7;
+  sfx.addSound('impact', impactSound);
+
+  sfx.setVolume(0.02);
+}

src/core/ColorSampler.ts

@@ -0,0 +1,102 @@
+import type { TileMap } from './TileMap.ts';
+import { Palette } from './Palette.ts';
+
+/**
+ * Utility for sampling colors from the background and tile map.
+ */
+export class ColorSampler {
+  private static cache: Map<string, string> = new Map();
+  private static cacheFrame: number = 0;
+
+  /**
+   * Sample the dominant color from a region around a position based on tile map and background.
+   * @param tileMap - The tile map to sample from
+   * @param x - Center X coordinate in world space
+   * @param y - Center Y coordinate in world space
+   * @param radius - Sampling radius in pixels
+   * @returns Dominant color as hex string (e.g., '#1a1a2e')
+   */
+  static sampleDominantColor(
+    tileMap: TileMap | null,
+    x: number,
+    y: number,
+    radius: number
+  ): string {
+    const cacheKey = `${Math.floor(x / 20)}_${Math.floor(y / 20)}`;
+    const currentFrame = Math.floor(Date.now() / 200);
+
+    if (currentFrame !== this.cacheFrame) {
+      this.cache.clear();
+      this.cacheFrame = currentFrame;
+    }
+
+    if (this.cache.has(cacheKey)) {
+      return this.cache.get(cacheKey) || Palette.VOID;
+    }
+
+    if (!tileMap) {
+      return Palette.VOID;
+    }
+
+    const tileSize = tileMap.tileSize;
+    const startCol = Math.max(0, Math.floor((x - radius) / tileSize));
+    const endCol = Math.min(tileMap.cols, Math.ceil((x + radius) / tileSize));
+    const startRow = Math.max(0, Math.floor((y - radius) / tileSize));
+    const endRow = Math.min(tileMap.rows, Math.ceil((y + radius) / tileSize));
+
+    const colorCounts: Map<string, number> = new Map();
+    let totalTiles = 0;
+
+    for (let r = startRow; r < endRow; r++) {
+      for (let c = startCol; c < endCol; c++) {
+        const tileType = tileMap.getTile(c, r);
+        let color: string;
+
+        if (tileType === 1) {
+          color = Palette.DARK_BLUE;
+        } else {
+          const distFromCenter = Math.sqrt(
+            Math.pow(c * tileSize - x, 2) + Math.pow(r * tileSize - y, 2)
+          );
+          if (distFromCenter < radius) {
+            const noise = Math.sin(c * 0.1 + r * 0.1) * 0.1;
+            if (Math.random() < 0.3 + noise) {
+              color = Palette.DARKER_BLUE;
+            } else {
+              color = Palette.VOID;
+            }
+          } else {
+            continue;
+          }
+        }
+
+        colorCounts.set(color, (colorCounts.get(color) || 0) + 1);
+        totalTiles++;
+      }
+    }
+
+    if (totalTiles === 0) {
+      return Palette.VOID;
+    }
+
+    let dominantColor = Palette.VOID;
+    let maxCount = 0;
+
+    colorCounts.forEach((count, color) => {
+      if (count > maxCount) {
+        maxCount = count;
+        dominantColor = color;
+      }
+    });
+
+    this.cache.set(cacheKey, dominantColor);
+    return dominantColor;
+  }
+
+  /**
+   * Clear the color sampling cache.
+   */
+  static clearCache(): void {
+    this.cache.clear();
+  }
+}

src/core/Component.js

@@ -1,14 +0,0 @@
-/**
- * Base Component class for ECS architecture
- * Components are pure data containers
- */
-export class Component {
-  constructor(type) {
-    this.type = type;
-  }
-
-  static getType() {
-    return this.name;
-  }
-}
-

src/core/Component.ts

@@ -0,0 +1,25 @@
+/**
+ * Base Component class for ECS architecture.
+ * Components are pure data containers.
+ */
+export class Component {
+  /**
+   * The unique type identifier for this component
+   */
+  readonly type: string;
+
+  /**
+   * @param type - The unique type identifier for this component
+   */
+  constructor(type: string) {
+    this.type = type;
+  }
+
+  /**
+   * Get the type name of the component class.
+   * @returns The name of the class
+   */
+  static getType(): string {
+    return this.name;
+  }
+}

src/core/Constants.ts

@@ -0,0 +1,88 @@
+/**
+ * Game state enumeration.
+ */
+export enum GameState {
+  /** Initial start screen */
+  START = 'start',
+  /** Active gameplay */
+  PLAYING = 'playing',
+  /** Game paused */
+  PAUSED = 'paused',
+  /** Player death screen */
+  GAME_OVER = 'gameOver',
+}
+
+/**
+ * Component type identifiers.
+ */
+export enum ComponentType {
+  POSITION = 'Position',
+  VELOCITY = 'Velocity',
+  SPRITE = 'Sprite',
+  HEALTH = 'Health',
+  COMBAT = 'Combat',
+  AI = 'AI',
+  EVOLUTION = 'Evolution',
+  STATS = 'Stats',
+  SKILLS = 'Skills',
+  SKILL_PROGRESS = 'SkillProgress',
+  ABSORBABLE = 'Absorbable',
+  STEALTH = 'Stealth',
+  INTENT = 'Intent',
+  INVENTORY = 'Inventory',
+  MUSIC = 'Music',
+  SOUND_EFFECTS = 'SoundEffects',
+  CAMERA = 'Camera',
+}
+
+/**
+ * Entity type identifiers for sprites and behaviors.
+ */
+export enum EntityType {
+  SLIME = 'slime',
+  HUMANOID = 'humanoid',
+  BEAST = 'beast',
+  ELEMENTAL = 'elemental',
+  PROJECTILE = 'projectile',
+}
+
+/**
+ * Animation states for sprites.
+ */
+export enum AnimationState {
+  IDLE = 'idle',
+  WALK = 'walk',
+}
+
+/**
+ * Visual effect types.
+ */
+export enum VFXType {
+  IMPACT = 'impact',
+  ABSORPTION = 'absorption',
+}
+
+/**
+ * System name identifiers.
+ */
+export enum SystemName {
+  MENU = 'MenuSystem',
+  UI = 'UISystem',
+  PLAYER_CONTROLLER = 'PlayerControllerSystem',
+  ABSORPTION = 'AbsorptionSystem',
+  COMBAT = 'CombatSystem',
+  PROJECTILE = 'ProjectileSystem',
+  VFX = 'VFXSystem',
+  MOVEMENT = 'MovementSystem',
+  AI = 'AISystem',
+  DEATH = 'DeathSystem',
+  RENDER = 'RenderSystem',
+  INPUT = 'InputSystem',
+  SKILL_EFFECT = 'SkillEffectSystem',
+  SKILL = 'SkillSystem',
+  STEALTH = 'StealthSystem',
+  HEALTH_REGEN = 'HealthRegenerationSystem',
+  MUSIC = 'MusicSystem',
+  SOUND_EFFECTS = 'SoundEffectsSystem',
+  CAMERA = 'CameraSystem',
+}

src/core/Engine.js

@@ -1,139 +0,0 @@
-import { System } from './System.js';
-import { Entity } from './Entity.js';
-import { EventBus } from './EventBus.js';
-
-/**
- * Main game engine - manages ECS, game loop, and systems
- */
-export class Engine {
-  constructor(canvas) {
-    this.canvas = canvas;
-    this.ctx = canvas.getContext('2d');
-    this.entities = [];
-    this.systems = [];
-    this.events = new EventBus();
-    this.running = false;
-    this.lastTime = 0;
-
-    // Set canvas size
-    this.canvas.width = 1024;
-    this.canvas.height = 768;
-
-    // Game state
-    this.deltaTime = 0;
-  }
-
-  /**
-     * Add a system to the engine
-     */
-  addSystem(system) {
-    if (system instanceof System) {
-      system.init(this);
-      this.systems.push(system);
-      // Sort by priority (lower priority runs first)
-      this.systems.sort((a, b) => a.priority - b.priority);
-    }
-    return this;
-  }
-
-  /**
-     * Emit an event locally
-     */
-  emit(event, data) {
-    this.events.emit(event, data);
-  }
-
-  /**
-     * Subscribe to an event
-     */
-  on(event, callback) {
-    return this.events.on(event, callback);
-  }
-
-  /**
-     * Create and add an entity
-     */
-  createEntity() {
-    const entity = new Entity();
-    this.entities.push(entity);
-    return entity;
-  }
-
-  /**
-     * Remove an entity
-     */
-  removeEntity(entity) {
-    const index = this.entities.indexOf(entity);
-    if (index > -1) {
-      this.entities.splice(index, 1);
-    }
-  }
-
-  /**
-     * Get all entities
-     */
-  getEntities() {
-    return this.entities.filter(e => e.active);
-  }
-
-  /**
-     * Main game loop
-     */
-  start() {
-    if (this.running) return;
-    this.running = true;
-    this.lastTime = performance.now();
-    this.gameLoop();
-  }
-
-  /**
-     * Stop the game loop
-     */
-  stop() {
-    this.running = false;
-  }
-
-  /**
-     * Game loop using requestAnimationFrame
-     */
-  gameLoop = (currentTime = 0) => {
-    if (!this.running) return;
-
-    // Calculate delta time
-    this.deltaTime = (currentTime - this.lastTime) / 1000; // Convert to seconds
-    this.lastTime = currentTime;
-
-    // Clamp delta time to prevent large jumps
-    this.deltaTime = Math.min(this.deltaTime, 0.1);
-
-    // Update all systems
-    const menuSystem = this.systems.find(s => s.name === 'MenuSystem');
-    const gameState = menuSystem ? menuSystem.getGameState() : 'playing';
-    const isPaused = gameState === 'paused' || gameState === 'start';
-
-    this.systems.forEach(system => {
-      // Skip game systems if paused/start menu (but allow MenuSystem, UISystem, and RenderSystem)
-      if (isPaused && system.name !== 'MenuSystem' && system.name !== 'UISystem' && system.name !== 'RenderSystem') {
-        return;
-      }
-      system.update(this.deltaTime, this.entities);
-    });
-
-    // Update input system's previous states at end of frame
-    const inputSystem = this.systems.find(s => s.name === 'InputSystem');
-    if (inputSystem && inputSystem.updatePreviousStates) {
-      inputSystem.updatePreviousStates();
-    }
-
-    // Continue loop
-    requestAnimationFrame(this.gameLoop);
-  }
-
-  /**
-     * Clear the canvas
-     */
-  clear() {
-    this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
-  }
-}
-

src/core/Engine.ts

@@ -0,0 +1,171 @@
+import { System } from './System.ts';
+import { Entity } from './Entity.ts';
+import { EventBus } from './EventBus.ts';
+import { LevelLoader } from './LevelLoader.ts';
+import { GameState, SystemName } from './Constants.ts';
+import type { TileMap } from './TileMap.ts';
+import type { MenuSystem } from '../systems/MenuSystem.ts';
+import type { InputSystem } from '../systems/InputSystem.ts';
+
+/**
+ * Main game engine responsible for managing the ECS lifecycle, game loop, and system execution.
+ */
+export class Engine {
+  canvas: HTMLCanvasElement;
+  ctx: CanvasRenderingContext2D;
+  entities: Entity[];
+  systems: System[];
+  events: EventBus;
+  running: boolean;
+  lastTime: number;
+  deltaTime: number;
+  tileMap: TileMap | null;
+
+  /**
+   * @param canvas - The canvas element to render to
+   */
+  constructor(canvas: HTMLCanvasElement) {
+    this.canvas = canvas;
+    const ctx = canvas.getContext('2d');
+    if (!ctx) {
+      throw new Error('Failed to get 2d rendering context from canvas');
+    }
+    this.ctx = ctx;
+    this.entities = [];
+    this.systems = [];
+    this.events = new EventBus();
+    this.running = false;
+    this.lastTime = 0;
+
+    this.canvas.width = 320;
+    this.canvas.height = 240;
+
+    this.canvas.style.imageRendering = 'pixelated';
+    this.ctx.imageSmoothingEnabled = false;
+
+    this.deltaTime = 0;
+    this.tileMap = LevelLoader.loadDesignedLevel(200, 150, 16);
+  }
+
+  /**
+   * Add a system and sort systems by priority.
+   * @param system - The system to add
+   * @returns This engine instance
+   */
+  addSystem(system: System): Engine {
+    if (system instanceof System) {
+      system.init(this);
+      this.systems.push(system);
+      this.systems.sort((a, b) => a.priority - b.priority);
+    }
+    return this;
+  }
+
+  /**
+   * Emit a global event.
+   * @param event - Unique event identifier
+   * @param data - Optional event payload
+   */
+  emit(event: string, data?: unknown): void {
+    this.events.emit(event, data);
+  }
+
+  /**
+   * Subscribe to a global event.
+   * @param event - Unique event identifier
+   * @param callback - Function to execute when event is emitted
+   * @returns Unsubscribe function
+   */
+  on(event: string, callback: (data?: unknown) => void): () => void {
+    return this.events.on(event, callback);
+  }
+
+  /**
+   * Create a new entity and track it.
+   * @returns The newly created entity
+   */
+  createEntity(): Entity {
+    const entity = new Entity();
+    this.entities.push(entity);
+    return entity;
+  }
+
+  /**
+   * Permanently remove an entity from the engine.
+   * @param entity - The entity to remove
+   */
+  removeEntity(entity: Entity): void {
+    const index = this.entities.indexOf(entity);
+    if (index > -1) {
+      this.entities.splice(index, 1);
+    }
+  }
+
+  /**
+   * Retrieve all currently active entities.
+   * @returns List of active entities
+   */
+  getEntities(): Entity[] {
+    return this.entities.filter((e) => e.active);
+  }
+
+  /**
+   * Start the game loop.
+   */
+  start(): void {
+    if (this.running) return;
+    this.running = true;
+    this.lastTime = performance.now();
+    this.gameLoop();
+  }
+
+  /**
+   * Terminate the game loop.
+   */
+  stop(): void {
+    this.running = false;
+  }
+
+  /**
+   * Core game loop executing system updates.
+   * @param currentTime - High-resolution timestamp
+   */
+  gameLoop = (currentTime = 0): void => {
+    if (!this.running) return;
+
+    this.deltaTime = (currentTime - this.lastTime) / 1000;
+    this.lastTime = currentTime;
+
+    this.deltaTime = Math.min(this.deltaTime, 0.1);
+
+    const menuSystem = this.systems.find((s) => s.name === SystemName.MENU) as
+      | MenuSystem
+      | undefined;
+    const gameState = menuSystem ? menuSystem.getGameState() : GameState.PLAYING;
+    const isPaused = [GameState.PAUSED, GameState.START, GameState.GAME_OVER].includes(gameState);
+    const unskippedSystems = [SystemName.MENU, SystemName.UI, SystemName.RENDER, SystemName.MUSIC];
+
+    this.systems.forEach((system) => {
+      if (isPaused && !unskippedSystems.includes(system.name as SystemName)) {
+        return;
+      }
+      system.update(this.deltaTime, this.entities);
+    });
+
+    const inputSystem = this.systems.find((s) => s.name === SystemName.INPUT) as
+      | InputSystem
+      | undefined;
+    if (inputSystem && inputSystem.updatePreviousStates) {
+      inputSystem.updatePreviousStates();
+    }
+
+    requestAnimationFrame(this.gameLoop);
+  };
+
+  /**
+   * Clear the rendering surface.
+   */
+  clear(): void {
+    this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
+  }
+}

src/core/Entity.js

@@ -1,58 +0,0 @@
-/**
- * Entity class - represents a game object with a unique ID
- * Entities are just containers for components
- */
-export class Entity {
-  static nextId = 0;
-
-  constructor() {
-    this.id = Entity.nextId++;
-    this.components = new Map();
-    this.active = true;
-  }
-
-  /**
-     * Add a component to this entity
-     */
-  addComponent(component) {
-    this.components.set(component.type, component);
-    return this;
-  }
-
-  /**
-     * Get a component by type
-     */
-  getComponent(type) {
-    return this.components.get(type);
-  }
-
-  /**
-     * Check if entity has a component
-     */
-  hasComponent(type) {
-    return this.components.has(type);
-  }
-
-  /**
-     * Check if entity has all specified components
-     */
-  hasComponents(...types) {
-    return types.every(type => this.components.has(type));
-  }
-
-  /**
-     * Remove a component
-     */
-  removeComponent(type) {
-    this.components.delete(type);
-    return this;
-  }
-
-  /**
-     * Get all components
-     */
-  getAllComponents() {
-    return Array.from(this.components.values());
-  }
-}
-

src/core/Entity.ts

@@ -0,0 +1,82 @@
+import { Component } from './Component.ts';
+
+/**
+ * Entity class - represents a game object with a unique ID.
+ * Entities are containers for components.
+ */
+export class Entity {
+  private static nextId = 0;
+
+  readonly id: number;
+  private components: Map<string, Component>;
+  active: boolean;
+
+  owner?: number;
+  startX?: number;
+  startY?: number;
+  maxRange?: number;
+  lifetime?: number;
+  damage?: number;
+  deathTime?: number;
+
+  constructor() {
+    this.id = Entity.nextId++;
+    this.components = new Map();
+    this.active = true;
+  }
+
+  /**
+   * Add a component to this entity.
+   * @param component - The component to add
+   * @returns This entity for chaining
+   */
+  addComponent(component: Component): Entity {
+    this.components.set(component.type, component);
+    return this;
+  }
+
+  /**
+   * Get a component by type.
+   * @param type - The component type name
+   * @returns The component instance if found
+   */
+  getComponent<T extends Component>(type: string): T | undefined {
+    return this.components.get(type) as T | undefined;
+  }
+
+  /**
+   * Check if entity has a component.
+   * @param type - The component type name
+   * @returns True if the component exists
+   */
+  hasComponent(type: string): boolean {
+    return this.components.has(type);
+  }
+
+  /**
+   * Check if entity has all specified components.
+   * @param types - List of component type names
+   * @returns True if all components exist
+   */
+  hasComponents(...types: string[]): boolean {
+    return types.every((type) => this.components.has(type));
+  }
+
+  /**
+   * Remove a component.
+   * @param type - The component type name
+   * @returns This entity for chaining
+   */
+  removeComponent(type: string): Entity {
+    this.components.delete(type);
+    return this;
+  }
+
+  /**
+   * Get all components attached to this entity.
+   * @returns Array of components
+   */
+  getAllComponents(): Component[] {
+    return Array.from(this.components.values());
+  }
+}

src/core/EventBus.js

@@ -1,57 +0,0 @@
-/**
- * Lightweight EventBus for pub/sub communication between systems
- */
-export const Events = {
-  // Combat Events
-  DAMAGE_DEALT: 'combat:damage_dealt',
-  ENTITY_DIED: 'combat:entity_died',
-
-  // Evolution Events
-  EVOLVED: 'evolution:evolved',
-  MUTATION_GAINED: 'evolution:mutation_gained',
-
-  // Leveling Events
-  EXP_GAINED: 'stats:exp_gained',
-  LEVEL_UP: 'stats:level_up',
-
-  // Skill Events
-  SKILL_LEARNED: 'skills:learned',
-  SKILL_COOLDOWN_STARTED: 'skills:cooldown_started'
-};
-
-export class EventBus {
-  constructor() {
-    this.listeners = new Map();
-  }
-
-  /**
-     * Subscribe to an event
-     */
-  on(event, callback) {
-    if (!this.listeners.has(event)) {
-      this.listeners.set(event, []);
-    }
-    this.listeners.get(event).push(callback);
-    return () => this.off(event, callback);
-  }
-
-  /**
-     * Unsubscribe from an event
-     */
-  off(event, callback) {
-    if (!this.listeners.has(event)) return;
-    const callbacks = this.listeners.get(event);
-    const index = callbacks.indexOf(callback);
-    if (index > -1) {
-      callbacks.splice(index, 1);
-    }
-  }
-
-  /**
-     * Emit an event
-     */
-  emit(event, data) {
-    if (!this.listeners.has(event)) return;
-    this.listeners.get(event).forEach(callback => callback(data));
-  }
-}

src/core/EventBus.ts

@@ -0,0 +1,104 @@
+/**
+ * Enum for game-wide event types.
+ */
+export enum Events {
+  DAMAGE_DEALT = 'combat:damage_dealt',
+  ENTITY_DIED = 'combat:entity_died',
+  EVOLVED = 'evolution:evolved',
+  MUTATION_GAINED = 'evolution:mutation_gained',
+  EXP_GAINED = 'stats:exp_gained',
+  LEVEL_UP = 'stats:level_up',
+  SKILL_LEARNED = 'skills:learned',
+  ATTACK_PERFORMED = 'combat:attack_performed',
+  SKILL_COOLDOWN_STARTED = 'skills:cooldown_started',
+  ABSORPTION = 'absorption:absorbed',
+  PROJECTILE_CREATED = 'projectile:created',
+  PROJECTILE_IMPACT = 'projectile:impact',
+}
+
+/**
+ * Event data types
+ */
+export interface DamageDealtEvent {
+  x: number;
+  y: number;
+  value: number;
+  color: string;
+}
+
+export interface MutationGainedEvent {
+  name: string;
+  description?: string;
+}
+
+export interface SkillLearnedEvent {
+  id: string;
+}
+
+export interface EntityDiedEvent {
+  entity: unknown;
+}
+
+export interface AttackPerformedEvent {
+  entity: unknown;
+  angle: number;
+}
+
+type EventCallback = (data?: unknown) => void;
+
+/**
+ * Lightweight EventBus for pub/sub communication between systems.
+ */
+export class EventBus {
+  private listeners: Map<string, EventCallback[]>;
+
+  constructor() {
+    this.listeners = new Map();
+  }
+
+  /**
+   * Subscribe to an event with a callback.
+   * @param event - The event name from the Events enum
+   * @param callback - The function to call when the event is emitted
+   * @returns An unsubscribe function
+   */
+  on(event: string, callback: EventCallback): () => void {
+    if (!this.listeners.has(event)) {
+      this.listeners.set(event, []);
+    }
+    const callbacks = this.listeners.get(event);
+    if (callbacks) {
+      callbacks.push(callback);
+    }
+    return () => this.off(event, callback);
+  }
+
+  /**
+   * Unsubscribe a specific callback from an event.
+   * @param event - The event name
+   * @param callback - The original callback function to remove
+   */
+  off(event: string, callback: EventCallback): void {
+    if (!this.listeners.has(event)) return;
+    const callbacks = this.listeners.get(event);
+    if (callbacks) {
+      const index = callbacks.indexOf(callback);
+      if (index > -1) {
+        callbacks.splice(index, 1);
+      }
+    }
+  }
+
+  /**
+   * Emit an event to all subscribers.
+   * @param event - The event name
+   * @param data - Data to pass to the callbacks
+   */
+  emit(event: string, data?: unknown): void {
+    if (!this.listeners.has(event)) return;
+    const callbacks = this.listeners.get(event);
+    if (callbacks) {
+      callbacks.forEach((callback) => callback(data));
+    }
+  }
+}

src/core/LevelLoader.ts

@@ -0,0 +1,125 @@
+import { TileMap } from './TileMap.ts';
+
+/**
+ * Utility class responsible for generating or loading level tile maps.
+ */
+export class LevelLoader {
+  /**
+   * Generates a simple arena level with walls at the boundaries and random obstacles.
+   * @param cols - Map width in tiles
+   * @param rows - Map height in tiles
+   * @param tileSize - Tile size in pixels
+   * @returns The generated tile map
+   */
+  static loadSimpleLevel(cols: number, rows: number, tileSize: number): TileMap {
+    const map = new TileMap(cols, rows, tileSize);
+
+    for (let r = 0; r < rows; r++) {
+      for (let c = 0; c < cols; c++) {
+        if (r === 0 || r === rows - 1 || c === 0 || c === cols - 1) {
+          map.setTile(c, r, 1);
+        } else {
+          if (Math.random() < 0.1) {
+            map.setTile(c, r, 1);
+          }
+        }
+      }
+    }
+    return map;
+  }
+
+  /**
+   * Generates a larger designed map with rooms, corridors, and interesting layout.
+   * @param cols - Map width in tiles (default 200)
+   * @param rows - Map height in tiles (default 150)
+   * @param tileSize - Tile size in pixels (default 16)
+   * @returns The generated tile map
+   */
+  static loadDesignedLevel(cols = 200, rows = 150, tileSize = 16): TileMap {
+    const map = new TileMap(cols, rows, tileSize);
+
+    for (let r = 0; r < rows; r++) {
+      for (let c = 0; c < cols; c++) {
+        if (r === 0 || r === rows - 1 || c === 0 || c === cols - 1) {
+          map.setTile(c, r, 1);
+        } else {
+          map.setTile(c, r, 0);
+        }
+      }
+    }
+
+    const roomCount = 15;
+    const rooms: Array<{ x: number; y: number; w: number; h: number }> = [];
+
+    for (let i = 0; i < roomCount; i++) {
+      const roomW = 8 + Math.floor(Math.random() * 12);
+      const roomH = 8 + Math.floor(Math.random() * 12);
+      const roomX = 2 + Math.floor(Math.random() * (cols - roomW - 4));
+      const roomY = 2 + Math.floor(Math.random() * (rows - roomH - 4));
+
+      let overlaps = false;
+      for (const existingRoom of rooms) {
+        if (
+          roomX < existingRoom.x + existingRoom.w + 2 &&
+          roomX + roomW + 2 > existingRoom.x &&
+          roomY < existingRoom.y + existingRoom.h + 2 &&
+          roomY + roomH + 2 > existingRoom.y
+        ) {
+          overlaps = true;
+          break;
+        }
+      }
+
+      if (!overlaps) {
+        rooms.push({ x: roomX, y: roomY, w: roomW, h: roomH });
+
+        for (let ry = roomY; ry < roomY + roomH; ry++) {
+          for (let rx = roomX; rx < roomX + roomW; rx++) {
+            if (rx > 0 && rx < cols - 1 && ry > 0 && ry < rows - 1) {
+              map.setTile(rx, ry, 0);
+            }
+          }
+        }
+      }
+    }
+
+    for (let i = 1; i < rooms.length; i++) {
+      const prevRoom = rooms[i - 1];
+      const currRoom = rooms[i];
+
+      const startX = Math.floor(prevRoom.x + prevRoom.w / 2);
+      const startY = Math.floor(prevRoom.y + prevRoom.h / 2);
+      const endX = Math.floor(currRoom.x + currRoom.w / 2);
+      const endY = Math.floor(currRoom.y + currRoom.h / 2);
+
+      let x = startX;
+      let y = startY;
+
+      while (x !== endX || y !== endY) {
+        if (x > 0 && x < cols - 1 && y > 0 && y < rows - 1) {
+          map.setTile(x, y, 0);
+        }
+
+        if (x < endX) x++;
+        else if (x > endX) x--;
+
+        if (y < endY) y++;
+        else if (y > endY) y--;
+      }
+
+      if (x > 0 && x < cols - 1 && y > 0 && y < rows - 1) {
+        map.setTile(x, y, 0);
+      }
+    }
+
+    for (let r = 1; r < rows - 1; r++) {
+      for (let c = 1; c < cols - 1; c++) {
+        if (map.getTile(c, r) === 0 && Math.random() < 0.03) {
+          map.setTile(c, r, 1);
+        }
+      }
+    }
+
+    return map;
+  }
+}

src/core/Music.ts

@@ -0,0 +1,269 @@
+/**
+ * Note class - represents a single musical note
+ */
+export class Note {
+  frequency: number;
+  duration: number;
+
+  constructor(str: string) {
+    const couple = str.split(/\s+/);
+    this.frequency = Note.getFrequency(couple[0]) || 0;
+    this.duration = Note.getDuration(couple[1]) || 0;
+  }
+
+  /**
+   * Convert a note name (e.g. 'A4') to a frequency (e.g. 440.00)
+   */
+  static getFrequency(name: string): number {
+    const enharmonics = 'B#-C|C#-Db|D|D#-Eb|E-Fb|E#-F|F#-Gb|G|G#-Ab|A|A#-Bb|B-Cb';
+    const middleC = 440 * Math.pow(Math.pow(2, 1 / 12), -9);
+    const octaveOffset = 4;
+    const num = /(\d+)/;
+    const offsets: Record<string, number> = {};
+
+    enharmonics.split('|').forEach((val, i) => {
+      val.split('-').forEach((note) => {
+        offsets[note] = i;
+      });
+    });
+
+    const couple = name.split(num);
+    const distance = offsets[couple[0]] ?? 0;
+    const octaveDiff = parseInt(couple[1] || String(octaveOffset), 10) - octaveOffset;
+    const freq = middleC * Math.pow(Math.pow(2, 1 / 12), distance);
+    return freq * Math.pow(2, octaveDiff);
+  }
+
+  /**
+   * Convert a duration string (e.g. 'q') to a number (e.g. 1)
+   */
+  static getDuration(symbol: string): number {
+    const numeric = /^[0-9.]+$/;
+    if (numeric.test(symbol)) {
+      return parseFloat(symbol);
+    }
+    return symbol
+      .toLowerCase()
+      .split('')
+      .reduce((prev, curr) => {
+        return (
+          prev +
+          (curr === 'w'
+            ? 4
+            : curr === 'h'
+              ? 2
+              : curr === 'q'
+                ? 1
+                : curr === 'e'
+                  ? 0.5
+                  : curr === 's'
+                    ? 0.25
+                    : 0)
+        );
+      }, 0);
+  }
+}
+
+/**
+ * Sequence class - manages playback of musical sequences
+ */
+export class Sequence {
+  ac: AudioContext;
+  tempo: number;
+  loop: boolean;
+  smoothing: number;
+  staccato: number;
+  notes: Note[];
+  gain: GainNode;
+  bass: BiquadFilterNode | null;
+  mid: BiquadFilterNode | null;
+  treble: BiquadFilterNode | null;
+  waveType: OscillatorType | 'custom';
+  customWave?: [Float32Array, Float32Array];
+  osc: OscillatorNode | null;
+
+  constructor(ac?: AudioContext, tempo = 120, arr?: (Note | string)[]) {
+    this.ac = ac || new AudioContext();
+    this.tempo = tempo;
+    this.loop = true;
+    this.smoothing = 0;
+    this.staccato = 0;
+    this.notes = [];
+    this.bass = null;
+    this.mid = null;
+    this.treble = null;
+    this.osc = null;
+    this.waveType = 'square';
+    this.gain = this.ac.createGain();
+    this.createFxNodes();
+    if (arr) {
+      this.push(...arr);
+    }
+  }
+
+  /**
+   * Create gain and EQ nodes, then connect them
+   */
+  createFxNodes(): void {
+    const eq: Array<[string, number]> = [
+      ['bass', 100],
+      ['mid', 1000],
+      ['treble', 2500],
+    ];
+    let prev: AudioNode = this.gain;
+
+    eq.forEach((config) => {
+      const filter = this.ac.createBiquadFilter();
+      filter.type = 'peaking';
+      filter.frequency.value = config[1];
+      prev.connect(filter);
+      prev = filter;
+
+      if (config[0] === 'bass') {
+        this.bass = filter;
+      } else if (config[0] === 'mid') {
+        this.mid = filter;
+      } else if (config[0] === 'treble') {
+        this.treble = filter;
+      }
+    });
+
+    prev.connect(this.ac.destination);
+  }
+
+  /**
+   * Accepts Note instances or strings (e.g. 'A4 e')
+   */
+  push(...notes: (Note | string)[]): this {
+    notes.forEach((note) => {
+      this.notes.push(note instanceof Note ? note : new Note(note));
+    });
+    return this;
+  }
+
+  /**
+   * Create a custom waveform
+   */
+  createCustomWave(real: number[], imag?: number[]): void {
+    if (!imag) {
+      imag = real;
+    }
+    this.waveType = 'custom';
+    this.customWave = [new Float32Array(real), new Float32Array(imag)];
+  }
+
+  /**
+   * Recreate the oscillator node (happens on every play)
+   */
+  createOscillator(): this {
+    this.stop();
+    this.osc = this.ac.createOscillator();
+
+    if (this.customWave) {
+      this.osc.setPeriodicWave(this.ac.createPeriodicWave(this.customWave[0], this.customWave[1]));
+    } else {
+      this.osc.type = this.waveType === 'custom' ? 'square' : this.waveType;
+    }
+
+    if (this.gain) {
+      this.osc.connect(this.gain);
+    }
+    return this;
+  }
+
+  /**
+   * Schedule a note to play at the given time
+   */
+  scheduleNote(index: number, when: number): number {
+    const duration = (60 / this.tempo) * this.notes[index].duration;
+    const cutoff = duration * (1 - (this.staccato || 0));
+
+    this.setFrequency(this.notes[index].frequency, when);
+
+    if (this.smoothing && this.notes[index].frequency) {
+      this.slide(index, when, cutoff);
+    }
+
+    this.setFrequency(0, when + cutoff);
+    return when + duration;
+  }
+
+  /**
+   * Get the next note
+   */
+  getNextNote(index: number): Note {
+    return this.notes[index < this.notes.length - 1 ? index + 1 : 0];
+  }
+
+  /**
+   * How long do we wait before beginning the slide?
+   */
+  getSlideStartDelay(duration: number): number {
+    return duration - Math.min(duration, (60 / this.tempo) * this.smoothing);
+  }
+
+  /**
+   * Slide the note at index into the next note
+   */
+  slide(index: number, when: number, cutoff: number): this {
+    const next = this.getNextNote(index);
+    const start = this.getSlideStartDelay(cutoff);
+    this.setFrequency(this.notes[index].frequency, when + start);
+    this.rampFrequency(next.frequency, when + cutoff);
+    return this;
+  }
+
+  /**
+   * Set frequency at time
+   */
+  setFrequency(freq: number, when: number): this {
+    if (this.osc) {
+      this.osc.frequency.setValueAtTime(freq, when);
+    }
+    return this;
+  }
+
+  /**
+   * Ramp to frequency at time
+   */
+  rampFrequency(freq: number, when: number): this {
+    if (this.osc) {
+      this.osc.frequency.linearRampToValueAtTime(freq, when);
+    }
+    return this;
+  }
+
+  /**
+   * Run through all notes in the sequence and schedule them
+   */
+  play(when?: number): this {
+    const startTime = typeof when === 'number' ? when : this.ac.currentTime;
+
+    this.createOscillator();
+    if (this.osc) {
+      this.osc.start(startTime);
+
+      let currentTime = startTime;
+      this.notes.forEach((_note, i) => {
+        currentTime = this.scheduleNote(i, currentTime);
+      });
+
+      this.osc.stop(currentTime);
+      this.osc.onended = this.loop ? () => this.play(currentTime) : null;
+    }
+
+    return this;
+  }
+
+  /**
+   * Stop playback
+   */
+  stop(): this {
+    if (this.osc) {
+      this.osc.onended = null;
+      this.osc.disconnect();
+      this.osc = null;
+    }
+    return this;
+  }
+}

src/core/Palette.ts

@@ -0,0 +1,35 @@
+/**
+ * Limited color palette used throughout the game to ensure a consistent aesthetic.
+ */
+export const Palette = {
+  /** Highlights and UI Text */
+  WHITE: '#ffffff',
+  /** Energy and Slime core */
+  CYAN: '#0ce6f2',
+  /** Water and friendly elements */
+  SKY_BLUE: '#0098db',
+  /** Shadows and visual depth */
+  ROYAL_BLUE: '#1e579c',
+  /** Walls and obstacles */
+  DARK_BLUE: '#203562',
+  /** Background details */
+  DARKER_BLUE: '#252446',
+  /** Deep background and void */
+  VOID: '#201533',
+
+  /**
+   * Get all colors in the palette as an array.
+   * @returns Array of hex color strings
+   */
+  getAll(): string[] {
+    return [
+      this.WHITE,
+      this.CYAN,
+      this.SKY_BLUE,
+      this.ROYAL_BLUE,
+      this.DARK_BLUE,
+      this.DARKER_BLUE,
+      this.VOID,
+    ];
+  },
+};

src/core/PixelFont.ts

@@ -0,0 +1,107 @@
+/**
+ * Simple 5x7 Matrix Pixel Font data.
+ * Each character is represented by an array of 7 integers, where each integer is a 5-bit mask.
+ * Using Map for better minification/mangling support.
+ */
+const FONT_DATA = new Map<string, readonly number[]>([
+  ['A', [0x0e, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11]],
+  ['B', [0x1e, 0x11, 0x11, 0x1e, 0x11, 0x11, 0x1e]],
+  ['C', [0x0e, 0x11, 0x11, 0x10, 0x11, 0x11, 0x0e]],
+  ['D', [0x1e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x1e]],
+  ['E', [0x1f, 0x10, 0x10, 0x1e, 0x10, 0x10, 0x1f]],
+  ['F', [0x1f, 0x10, 0x10, 0x1e, 0x10, 0x10, 0x10]],
+  ['G', [0x0f, 0x10, 0x10, 0x17, 0x11, 0x11, 0x0f]],
+  ['H', [0x11, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11]],
+  ['I', [0x0e, 0x04, 0x04, 0x04, 0x04, 0x04, 0x0e]],
+  ['J', [0x07, 0x02, 0x02, 0x02, 0x02, 0x12, 0x0c]],
+  ['K', [0x11, 0x12, 0x14, 0x18, 0x14, 0x12, 0x11]],
+  ['L', [0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x1f]],
+  ['M', [0x11, 0x1b, 0x15, 0x15, 0x11, 0x11, 0x11]],
+  ['N', [0x11, 0x11, 0x19, 0x15, 0x13, 0x11, 0x11]],
+  ['O', [0x0e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e]],
+  ['P', [0x1e, 0x11, 0x11, 0x1e, 0x10, 0x10, 0x10]],
+  ['Q', [0x0e, 0x11, 0x11, 0x11, 0x15, 0x12, 0x0d]],
+  ['R', [0x1e, 0x11, 0x11, 0x1e, 0x14, 0x12, 0x11]],
+  ['S', [0x0e, 0x11, 0x10, 0x0e, 0x01, 0x11, 0x0e]],
+  ['T', [0x1f, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04]],
+  ['U', [0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e]],
+  ['V', [0x11, 0x11, 0x11, 0x11, 0x11, 0x0a, 0x04]],
+  ['W', [0x11, 0x11, 0x11, 0x15, 0x15, 0x1b, 0x11]],
+  ['X', [0x11, 0x11, 0x0a, 0x04, 0x0a, 0x11, 0x11]],
+  ['Y', [0x11, 0x11, 0x0a, 0x04, 0x04, 0x04, 0x04]],
+  ['Z', [0x1f, 0x01, 0x02, 0x04, 0x08, 0x10, 0x1f]],
+  ['0', [0x0e, 0x11, 0x13, 0x15, 0x19, 0x11, 0x0e]],
+  ['1', [0x04, 0x0c, 0x04, 0x04, 0x04, 0x04, 0x0e]],
+  ['2', [0x0e, 0x11, 0x01, 0x02, 0x04, 0x08, 0x1f]],
+  ['3', [0x1f, 0x02, 0x04, 0x02, 0x01, 0x11, 0x0e]],
+  ['4', [0x02, 0x06, 0x0a, 0x12, 0x1f, 0x02, 0x02]],
+  ['5', [0x1f, 0x10, 0x1e, 0x01, 0x01, 0x11, 0x0e]],
+  ['6', [0x06, 0x08, 0x10, 0x1e, 0x11, 0x11, 0x0e]],
+  ['7', [0x1f, 0x01, 0x02, 0x04, 0x08, 0x08, 0x08]],
+  ['8', [0x0e, 0x11, 0x11, 0x0e, 0x11, 0x11, 0x0e]],
+  ['9', [0x0e, 0x11, 0x11, 0x0f, 0x01, 0x02, 0x0c]],
+  [':', [0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00]],
+  ['.', [0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00]],
+  [',', [0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08]],
+  ['!', [0x04, 0x04, 0x04, 0x04, 0x04, 0x00, 0x04]],
+  ['?', [0x0e, 0x11, 0x01, 0x02, 0x04, 0x00, 0x04]],
+  ['+', [0x00, 0x04, 0x04, 0x1f, 0x04, 0x04, 0x00]],
+  ['-', [0x00, 0x00, 0x00, 0x1f, 0x00, 0x00, 0x00]],
+  ['/', [0x01, 0x02, 0x04, 0x08, 0x10, 0x10, 0x10]],
+  ['(', [0x02, 0x04, 0x04, 0x04, 0x04, 0x04, 0x02]],
+  [')', [0x08, 0x04, 0x04, 0x04, 0x04, 0x04, 0x08]],
+  [' ', [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]],
+  ['|', [0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04]],
+]);
+
+/**
+ * Utility class for rendering text using a custom pixel font.
+ */
+export const PixelFont = {
+  /**
+   * Render a string of text to the canvas.
+   * @param ctx - The rendering context
+   * @param text - The text to draw
+   * @param x - Horizontal start position
+   * @param y - Vertical start position
+   * @param color - The color of the text
+   * @param scale - Pixel scale factor
+   */
+  drawText(
+    ctx: CanvasRenderingContext2D,
+    text: string,
+    x: number,
+    y: number,
+    color = '#ffffff',
+    scale = 1
+  ): void {
+    ctx.save();
+    ctx.fillStyle = color;
+    let cursorX = x;
+
+    const chars = text.toUpperCase().split('');
+    chars.forEach((char) => {
+      const glyph = FONT_DATA.get(char) || FONT_DATA.get('?');
+      if (!glyph) return;
+      for (let row = 0; row < 7; row++) {
+        for (let col = 0; col < 5; col++) {
+          if ((glyph[row] >> (4 - col)) & 1) {
+            ctx.fillRect(cursorX + col * scale, y + row * scale, scale, scale);
+          }
+        }
+      }
+      cursorX += 6 * scale;
+    });
+    ctx.restore();
+  },
+
+  /**
+   * Calculate the total width of a string of text when rendered.
+   * @param text - The text string
+   * @param scale - Pixel scale factor
+   * @returns Width in pixels
+   */
+  getTextWidth(text: string, scale = 1): number {
+    return text.length * 6 * scale;
+  },
+};

src/core/SpriteLibrary.ts

@@ -0,0 +1,182 @@
+import { EntityType, AnimationState } from './Constants.ts';
+
+/**
+ * A 2D grid of pixel values (0-3)
+ */
+export type SpriteFrame = number[][];
+
+/**
+ * An array of frames forming an animation
+ */
+export type SpriteAnimation = SpriteFrame[];
+
+/**
+ * A map of animation states to animations
+ */
+export type EntitySpriteData = Record<string, SpriteAnimation>;
+
+/**
+ * Sprite Library defining pixel art grids as 2D arrays.
+ *
+ * Pixel Values:
+ * 0: Transparent
+ * 1: Primary Color (Entity Color)
+ * 2: Highlight (White / Shine)
+ * 3: Detail/Shade (Darker Blue / Eyes)
+ */
+export const SpriteLibrary: Record<string, EntitySpriteData> = {
+  [EntityType.SLIME]: {
+    [AnimationState.IDLE]: [
+      [
+        [0, 0, 0, 0, 0, 0, 0, 0],
+        [0, 0, 1, 1, 1, 1, 0, 0],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 1, 2, 1, 1, 2, 1, 1],
+        [1, 1, 3, 1, 1, 3, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+      ],
+      [
+        [0, 0, 0, 0, 0, 0, 0, 0],
+        [0, 0, 0, 0, 0, 0, 0, 0],
+        [0, 0, 1, 1, 1, 1, 0, 0],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 1, 2, 1, 1, 2, 1, 1],
+        [1, 1, 3, 1, 1, 3, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+      ],
+    ],
+    [AnimationState.WALK]: [
+      [
+        [0, 0, 1, 1, 1, 1, 0, 0],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 1, 2, 1, 1, 2, 1, 1],
+        [1, 1, 3, 1, 1, 3, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 3, 1, 1, 1, 1, 3, 1],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+      ],
+      [
+        [0, 0, 0, 0, 0, 0, 0, 0],
+        [0, 0, 1, 1, 1, 1, 0, 0],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 1, 2, 1, 1, 2, 1, 1],
+        [1, 1, 3, 1, 1, 3, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+      ],
+    ],
+  },
+
+  [EntityType.HUMANOID]: {
+    [AnimationState.IDLE]: [
+      [
+        [0, 0, 0, 1, 1, 0, 0, 0],
+        [0, 0, 2, 1, 1, 2, 0, 0],
+        [0, 0, 0, 1, 1, 0, 0, 0],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 0, 2, 1, 1, 2, 0, 1],
+        [1, 0, 1, 1, 1, 1, 0, 1],
+        [0, 0, 1, 0, 0, 1, 0, 0],
+        [0, 0, 1, 0, 0, 1, 0, 0],
+      ],
+    ],
+    [AnimationState.WALK]: [
+      [
+        [0, 0, 0, 1, 1, 0, 0, 0],
+        [0, 0, 2, 1, 1, 2, 0, 0],
+        [0, 0, 0, 1, 1, 0, 0, 0],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [0, 0, 2, 1, 1, 2, 0, 1],
+        [0, 0, 1, 1, 1, 1, 0, 1],
+        [0, 0, 1, 0, 0, 0, 0, 0],
+        [0, 1, 1, 0, 0, 0, 0, 0],
+      ],
+      [
+        [0, 0, 0, 1, 1, 0, 0, 0],
+        [0, 0, 2, 1, 1, 2, 0, 0],
+        [0, 0, 0, 1, 1, 0, 0, 0],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 0, 2, 1, 1, 2, 0, 0],
+        [1, 0, 1, 1, 1, 1, 0, 0],
+        [0, 0, 0, 0, 0, 1, 0, 0],
+        [0, 0, 0, 0, 0, 1, 1, 0],
+      ],
+    ],
+  },
+
+  [EntityType.BEAST]: {
+    [AnimationState.IDLE]: [
+      [
+        [0, 0, 0, 0, 0, 0, 0, 0],
+        [1, 0, 0, 0, 0, 0, 0, 1],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 3, 1, 1, 1, 1, 3, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [0, 1, 1, 2, 2, 1, 1, 0],
+        [0, 1, 0, 0, 0, 0, 1, 0],
+        [0, 1, 0, 0, 0, 0, 1, 0],
+      ],
+    ],
+    [AnimationState.WALK]: [
+      [
+        [1, 0, 0, 0, 0, 0, 0, 1],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 3, 1, 1, 1, 1, 3, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [0, 1, 1, 2, 2, 1, 1, 0],
+        [0, 1, 0, 0, 0, 0, 1, 0],
+        [1, 1, 0, 0, 0, 0, 1, 1],
+        [0, 0, 0, 0, 0, 0, 0, 0],
+      ],
+      [
+        [0, 0, 0, 0, 0, 0, 0, 0],
+        [1, 0, 0, 0, 0, 0, 0, 1],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [1, 3, 1, 1, 1, 1, 3, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1],
+        [0, 1, 1, 2, 2, 1, 1, 0],
+        [0, 0, 1, 0, 0, 1, 0, 0],
+        [0, 0, 1, 0, 0, 1, 0, 0],
+      ],
+    ],
+  },
+
+  [EntityType.ELEMENTAL]: {
+    [AnimationState.IDLE]: [
+      [
+        [0, 0, 2, 1, 1, 2, 0, 0],
+        [0, 1, 1, 2, 2, 1, 1, 0],
+        [1, 2, 1, 1, 1, 1, 2, 1],
+        [1, 1, 3, 3, 3, 3, 1, 1],
+        [1, 1, 1, 3, 3, 1, 1, 1],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [0, 0, 1, 1, 1, 1, 0, 0],
+        [0, 0, 0, 1, 1, 0, 0, 0],
+      ],
+      [
+        [0, 0, 0, 0, 0, 0, 0, 0],
+        [0, 0, 2, 1, 1, 2, 0, 0],
+        [0, 1, 1, 2, 2, 1, 1, 0],
+        [1, 2, 3, 3, 3, 3, 2, 1],
+        [1, 1, 1, 3, 3, 1, 1, 1],
+        [0, 1, 1, 1, 1, 1, 1, 0],
+        [0, 0, 1, 1, 1, 1, 0, 0],
+        [0, 0, 0, 1, 1, 0, 0, 0],
+      ],
+    ],
+  },
+
+  [EntityType.PROJECTILE]: {
+    [AnimationState.IDLE]: [
+      [
+        [1, 1],
+        [1, 1],
+      ],
+    ],
+  },
+};

src/core/System.js

@@ -1,45 +0,0 @@
-/**
- * Base System class for ECS architecture
- * Systems contain logic that operates on entities with specific components
- */
-export class System {
-  constructor(name) {
-    this.name = name;
-    this.requiredComponents = [];
-    this.priority = 0; // Lower priority runs first
-  }
-
-  /**
-     * Check if an entity matches this system's requirements
-     */
-  matches(entity) {
-    if (!entity.active) return false;
-    return this.requiredComponents.every(componentType =>
-      entity.hasComponent(componentType)
-    );
-  }
-
-  /**
-     * Update method - override in subclasses
-     */
-  update(deltaTime, entities) {
-    // Filter entities that match this system's requirements
-    const matchingEntities = entities.filter(entity => this.matches(entity));
-    this.process(deltaTime, matchingEntities);
-  }
-
-  /**
-     * Process matching entities - override in subclasses
-     */
-  process(_deltaTime, _entities) {
-    // Override in subclasses
-  }
-
-  /**
-     * Called when system is added to engine
-     */
-  init(engine) {
-    this.engine = engine;
-  }
-}
-

src/core/System.ts

@@ -0,0 +1,64 @@
+import { Entity } from './Entity.ts';
+import type { Engine } from './Engine.ts';
+
+/**
+ * Base System class for ECS architecture.
+ * Systems contain logic that operates on entities with specific components.
+ */
+export class System {
+  /** Unique identifier for the system */
+  readonly name: string;
+
+  /** List of component types required by this system */
+  requiredComponents: string[];
+
+  /** Execution priority (lower runs first) */
+  priority: number;
+
+  /** Reference to the game engine */
+  protected engine!: Engine;
+
+  /**
+   * @param name - The unique name of the system
+   */
+  constructor(name: string) {
+    this.name = name;
+    this.requiredComponents = [];
+    this.priority = 0;
+  }
+
+  /**
+   * Check if an entity matches this system's requirements.
+   * @param entity - The entity to check
+   * @returns True if the entity is active and has all required components
+   */
+  matches(entity: Entity): boolean {
+    if (!entity.active) return false;
+    return this.requiredComponents.every((componentType) => entity.hasComponent(componentType));
+  }
+
+  /**
+   * Main update entry point called every frame.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   * @param entities - All entities in the engine
+   */
+  update(deltaTime: number, entities: Entity[]): void {
+    const matchingEntities = entities.filter((entity) => this.matches(entity));
+    this.process(deltaTime, matchingEntities);
+  }
+
+  /**
+   * Process matching entities. To be implemented by subclasses.
+   * @param _deltaTime - Time elapsed since last frame in seconds
+   * @param _entities - Filtered entities that match this system
+   */
+  process(_deltaTime: number, _entities: Entity[]): void {}
+
+  /**
+   * Called when system is added to engine.
+   * @param engine - The game engine instance
+   */
+  init(engine: Engine): void {
+    this.engine = engine;
+  }
+}

src/core/TileMap.ts

@@ -0,0 +1,68 @@
+/**
+ * Class representing a grid-based tile map for the game level.
+ */
+export class TileMap {
+  cols: number;
+  rows: number;
+  tileSize: number;
+  tiles: number[];
+
+  /**
+   * @param cols - Number of columns
+   * @param rows - Number of rows
+   * @param tileSize - Size of each tile in pixels
+   */
+  constructor(cols: number, rows: number, tileSize: number) {
+    this.cols = cols;
+    this.rows = rows;
+    this.tileSize = tileSize;
+    this.tiles = new Array(cols * rows).fill(0);
+  }
+
+  /**
+   * Set the value of a specific tile.
+   * @param col - Tile column
+   * @param row - Tile row
+   * @param value - Tile type value
+   */
+  setTile(col: number, row: number, value: number): void {
+    if (this.isValid(col, row)) {
+      this.tiles[row * this.cols + col] = value;
+    }
+  }
+
+  /**
+   * Get the type value of a tile. Treats out-of-bounds as solid.
+   * @param col - Tile column
+   * @param row - Tile row
+   * @returns The tile type value
+   */
+  getTile(col: number, row: number): number {
+    if (this.isValid(col, row)) {
+      return this.tiles[row * this.cols + col];
+    }
+    return 1;
+  }
+
+  /**
+   * Check if a tile coordinate is within the map boundaries.
+   * @param col - Tile column
+   * @param row - Tile row
+   * @returns True if coordinates are valid
+   */
+  isValid(col: number, row: number): boolean {
+    return col >= 0 && col < this.cols && row >= 0 && row < this.rows;
+  }
+
+  /**
+   * Check if a world position (x, y) collides with a solid tile.
+   * @param x - World X coordinate
+   * @param y - World Y coordinate
+   * @returns True if the position is solid
+   */
+  isSolid(x: number, y: number): boolean {
+    const col = Math.floor(x / this.tileSize);
+    const row = Math.floor(y / this.tileSize);
+    return this.getTile(col, row) !== 0;
+  }
+}

src/items/Item.js

@@ -1,13 +0,0 @@
-/**
- * Base Item class
- */
-export class Item {
-  constructor(id, name, type = 'consumable') {
-    this.id = id;
-    this.name = name;
-    this.type = type; // 'consumable', 'weapon', 'armor', 'accessory'
-    this.description = '';
-    this.value = 0;
-  }
-}
-

src/items/Item.ts

@@ -0,0 +1,46 @@
+/**
+ * Base class for all obtainable items in the game.
+ */
+export class Item {
+  id: string;
+  name: string;
+  type: string;
+  description: string;
+  value: number;
+
+  /**
+   * @param id - Unique identifier for the item
+   * @param name - Display name of the item
+   * @param type - Item category (e.g., 'consumable', 'weapon', 'armor', 'accessory')
+   */
+  constructor(id: string, name: string, type = 'consumable') {
+    this.id = id;
+    this.name = name;
+    this.type = type;
+    this.description = '';
+    this.value = 0;
+  }
+}
+
+/**
+ * Weapon item with damage and attack speed properties
+ */
+export interface WeaponItem extends Item {
+  damage: number;
+  attackSpeed: number;
+}
+
+/**
+ * Armor item with defense and HP properties
+ */
+export interface ArmorItem extends Item {
+  defense: number;
+  maxHp: number;
+}
+
+/**
+ * Consumable item with heal amount property
+ */
+export interface ConsumableItem extends Item {
+  healAmount: number;
+}

src/items/ItemRegistry.js

@@ -1,53 +0,0 @@
-import { Item } from './Item.js';
-
-/**
- * Registry for all items in the game
- */
-export class ItemRegistry {
-  static items = new Map();
-
-  static {
-    // Register items
-    // Weapons
-    this.register(this.createWeapon('iron_sword', 'Iron Sword', 15, 5));
-    this.register(this.createWeapon('steel_claw', 'Steel Claw', 20, 3));
-        
-    // Armor
-    this.register(this.createArmor('leather_armor', 'Leather Armor', 10, 5));
-        
-    // Consumables
-    this.register(this.createConsumable('health_potion', 'Health Potion', 50));
-  }
-
-  static register(item) {
-    this.items.set(item.id, item);
-  }
-
-  static get(id) {
-    return this.items.get(id);
-  }
-
-  static createWeapon(id, name, damage, speed) {
-    const item = new Item(id, name, 'weapon');
-    item.damage = damage;
-    item.attackSpeed = speed;
-    item.description = `Weapon: +${damage} damage, ${speed} speed`;
-    return item;
-  }
-
-  static createArmor(id, name, defense, hp) {
-    const item = new Item(id, name, 'armor');
-    item.defense = defense;
-    item.maxHp = hp;
-    item.description = `Armor: +${defense} defense, +${hp} HP`;
-    return item;
-  }
-
-  static createConsumable(id, name, healAmount) {
-    const item = new Item(id, name, 'consumable');
-    item.healAmount = healAmount;
-    item.description = `Restores ${healAmount} HP`;
-    return item;
-  }
-}
-

src/items/ItemRegistry.ts

@@ -0,0 +1,78 @@
+import { Item, WeaponItem, ArmorItem, ConsumableItem } from './Item.ts';
+
+/**
+ * Static registry responsible for defining and storing all available items in the game.
+ */
+export class ItemRegistry {
+  static items = new Map<string, Item>();
+
+  static {
+    this.register(this.createWeapon('iron_sword', 'Iron Sword', 15, 5));
+    this.register(this.createWeapon('steel_claw', 'Steel Claw', 20, 3));
+    this.register(this.createArmor('leather_armor', 'Leather Armor', 10, 5));
+    this.register(this.createConsumable('health_potion', 'Health Potion', 50));
+  }
+
+  /**
+   * Register an item in the registry.
+   * @param item - The item instance to register
+   */
+  static register(item: Item): void {
+    this.items.set(item.id, item);
+  }
+
+  /**
+   * Get an item template by its ID.
+   * @param id - The item identifier
+   * @returns The item template or undefined if not found
+   */
+  static get(id: string): Item | undefined {
+    return this.items.get(id);
+  }
+
+  /**
+   * Create a weapon item template.
+   * @param id - Item identifier
+   * @param name - Display name
+   * @param damage - Attack damage bonus
+   * @param speed - Attack speed bonus
+   * @returns The generated weapon item
+   */
+  static createWeapon(id: string, name: string, damage: number, speed: number): WeaponItem {
+    const item = new Item(id, name, 'weapon') as WeaponItem;
+    item.damage = damage;
+    item.attackSpeed = speed;
+    item.description = `Weapon: +${damage} damage, ${speed} speed`;
+    return item;
+  }
+
+  /**
+   * Create an armor item template.
+   * @param id - Item identifier
+   * @param name - Display name
+   * @param defense - Defense bonus
+   * @param hp - Bonus HP
+   * @returns The generated armor item
+   */
+  static createArmor(id: string, name: string, defense: number, hp: number): ArmorItem {
+    const item = new Item(id, name, 'armor') as ArmorItem;
+    item.defense = defense;
+    item.maxHp = hp;
+    item.description = `Armor: +${defense} defense, +${hp} HP`;
+    return item;
+  }
+
+  /**
+   * Create a consumable item template.
+   * @param id - Item identifier
+   * @param name - Display name
+   * @param healAmount - Healing amount
+   * @returns The generated consumable item
+   */
+  static createConsumable(id: string, name: string, healAmount: number): ConsumableItem {
+    const item = new Item(id, name, 'consumable') as ConsumableItem;
+    item.healAmount = healAmount;
+    item.description = `Restores ${healAmount} HP`;
+    return item;
+  }
+}

src/main.js

@@ -1,158 +0,0 @@
-import { Engine } from './core/Engine.js';
-import { InputSystem } from './systems/InputSystem.js';
-import { MovementSystem } from './systems/MovementSystem.js';
-import { PlayerControllerSystem } from './systems/PlayerControllerSystem.js';
-import { CombatSystem } from './systems/CombatSystem.js';
-import { AISystem } from './systems/AISystem.js';
-import { AbsorptionSystem } from './systems/AbsorptionSystem.js';
-import { SkillSystem } from './systems/SkillSystem.js';
-import { StealthSystem } from './systems/StealthSystem.js';
-import { ProjectileSystem } from './systems/ProjectileSystem.js';
-import { SkillEffectSystem } from './systems/SkillEffectSystem.js';
-import { HealthRegenerationSystem } from './systems/HealthRegenerationSystem.js';
-import { DeathSystem } from './systems/DeathSystem.js';
-import { MenuSystem } from './systems/MenuSystem.js';
-import { RenderSystem } from './systems/RenderSystem.js';
-import { UISystem } from './systems/UISystem.js';
-
-// Components
-import { Position } from './components/Position.js';
-import { Velocity } from './components/Velocity.js';
-import { Sprite } from './components/Sprite.js';
-import { Health } from './components/Health.js';
-import { Stats } from './components/Stats.js';
-import { Evolution } from './components/Evolution.js';
-import { Skills } from './components/Skills.js';
-import { Inventory } from './components/Inventory.js';
-import { Combat } from './components/Combat.js';
-import { Stealth } from './components/Stealth.js';
-import { AI } from './components/AI.js';
-import { Absorbable } from './components/Absorbable.js';
-import { SkillProgress } from './components/SkillProgress.js';
-
-// Initialize game
-const canvas = document.getElementById('game-canvas');
-if (!canvas) {
-  console.error('Canvas element not found!');
-} else {
-  const engine = new Engine(canvas);
-
-  // Add systems in order
-  engine.addSystem(new MenuSystem(engine));
-  engine.addSystem(new InputSystem());
-  engine.addSystem(new PlayerControllerSystem());
-  engine.addSystem(new StealthSystem());
-  engine.addSystem(new AISystem());
-  engine.addSystem(new MovementSystem());
-  engine.addSystem(new CombatSystem());
-  engine.addSystem(new ProjectileSystem());
-  engine.addSystem(new AbsorptionSystem());
-  engine.addSystem(new SkillSystem());
-  engine.addSystem(new SkillEffectSystem());
-  engine.addSystem(new HealthRegenerationSystem());
-  engine.addSystem(new DeathSystem());
-  engine.addSystem(new RenderSystem(engine));
-  engine.addSystem(new UISystem(engine));
-
-  // Create player entity
-  const player = engine.createEntity();
-  player.addComponent(new Position(512, 384));
-  player.addComponent(new Velocity(0, 0, 200));
-  player.addComponent(new Sprite('#00ff96', 40, 40, 'slime'));
-  player.addComponent(new Health(100));
-  player.addComponent(new Stats());
-  player.addComponent(new Evolution());
-
-  // Give player a starting skill so they can test it
-  const playerSkills = new Skills();
-  playerSkills.addSkill('slime_gun', false); // Add slime_gun as starting skill (basic slime ability)
-  player.addComponent(playerSkills);
-
-  player.addComponent(new Inventory());
-  player.addComponent(new Combat());
-  player.addComponent(new Stealth());
-  player.addComponent(new SkillProgress()); // Track skill learning progress
-
-  // Create creatures
-  function createCreature(engine, x, y, type) {
-    const creature = engine.createEntity();
-    creature.addComponent(new Position(x, y));
-    creature.addComponent(new Velocity(0, 0, 100));
-
-    let color, evolutionData, skills;
-
-    switch (type) {
-    case 'humanoid':
-      color = '#ff5555'; // Humanoid red
-      evolutionData = { human: 10, beast: 0, slime: -2 };
-      skills = ['fire_breath'];
-      break;
-    case 'beast':
-      color = '#ffaa00'; // Beast orange
-      evolutionData = { human: 0, beast: 10, slime: -2 };
-      skills = ['pounce'];
-      break;
-    case 'elemental':
-      color = '#00bfff';
-      evolutionData = { human: 3, beast: 3, slime: 8 };
-      skills = ['fire_breath'];
-      break;
-    default:
-      color = '#888888';
-      evolutionData = { human: 2, beast: 2, slime: 2 };
-      skills = [];
-    }
-
-    creature.addComponent(new Sprite(color, 25, 25, 'circle'));
-    creature.addComponent(new Health(50 + Math.random() * 30));
-    creature.addComponent(new Stats());
-    creature.addComponent(new Combat());
-    creature.addComponent(new AI('wander'));
-
-    const absorbable = new Absorbable();
-    absorbable.setEvolutionData(evolutionData.human, evolutionData.beast, evolutionData.slime);
-    skills.forEach(skill => absorbable.addSkill(skill, 0.3));
-    creature.addComponent(absorbable);
-
-    return creature;
-  }
-
-  // Spawn initial creatures
-  for (let i = 0; i < 8; i++) {
-    const x = 100 + Math.random() * 824;
-    const y = 100 + Math.random() * 568;
-    const types = ['humanoid', 'beast', 'elemental'];
-    const type = types[Math.floor(Math.random() * types.length)];
-    createCreature(engine, x, y, type);
-  }
-
-  // Spawn new creatures periodically
-  setInterval(() => {
-    const existingCreatures = engine.getEntities().filter(e =>
-      e.hasComponent('AI') && e !== player
-    );
-
-    if (existingCreatures.length < 10) {
-      const x = 100 + Math.random() * 824;
-      const y = 100 + Math.random() * 568;
-      const types = ['humanoid', 'beast', 'elemental'];
-      const type = types[Math.floor(Math.random() * types.length)];
-      createCreature(engine, x, y, type);
-    }
-  }, 5000);
-
-  // Focus canvas for keyboard input
-  canvas.focus();
-
-  // Start engine but MenuSystem will control when gameplay begins
-  engine.start();
-
-  // Make engine globally available for debugging
-  window.gameEngine = engine;
-  window.player = player;
-
-  // Re-focus canvas on click
-  canvas.addEventListener('click', () => {
-    canvas.focus();
-  });
-}

src/main.ts

@@ -0,0 +1,236 @@
+import { Engine } from './core/Engine.ts';
+import { InputSystem } from './systems/InputSystem.ts';
+import { MovementSystem } from './systems/MovementSystem.ts';
+import { PlayerControllerSystem } from './systems/PlayerControllerSystem.ts';
+import { CombatSystem } from './systems/CombatSystem.ts';
+import { AISystem } from './systems/AISystem.ts';
+import { AbsorptionSystem } from './systems/AbsorptionSystem.ts';
+import { SkillSystem } from './systems/SkillSystem.ts';
+import { StealthSystem } from './systems/StealthSystem.ts';
+import { ProjectileSystem } from './systems/ProjectileSystem.ts';
+import { SkillEffectSystem } from './systems/SkillEffectSystem.ts';
+import { HealthRegenerationSystem } from './systems/HealthRegenerationSystem.ts';
+import { DeathSystem } from './systems/DeathSystem.ts';
+import { MenuSystem } from './systems/MenuSystem.ts';
+import { RenderSystem } from './systems/RenderSystem.ts';
+import { UISystem } from './systems/UISystem.ts';
+import { VFXSystem } from './systems/VFXSystem.ts';
+import { MusicSystem } from './systems/MusicSystem.ts';
+import { SoundEffectsSystem } from './systems/SoundEffectsSystem.ts';
+import { CameraSystem } from './systems/CameraSystem.ts';
+
+import { Position } from './components/Position.ts';
+import { Velocity } from './components/Velocity.ts';
+import { Sprite } from './components/Sprite.ts';
+import { Health } from './components/Health.ts';
+import { Stats } from './components/Stats.ts';
+import { Evolution } from './components/Evolution.ts';
+import { Skills } from './components/Skills.ts';
+import { Inventory } from './components/Inventory.ts';
+import { Combat } from './components/Combat.ts';
+import { Stealth } from './components/Stealth.ts';
+import { AI } from './components/AI.ts';
+import { Absorbable } from './components/Absorbable.ts';
+import { SkillProgress } from './components/SkillProgress.ts';
+import { Intent } from './components/Intent.ts';
+import { Music } from './components/Music.ts';
+import { SoundEffects } from './components/SoundEffects.ts';
+import { Camera } from './components/Camera.ts';
+
+import { EntityType, ComponentType } from './core/Constants.ts';
+import type { Entity } from './core/Entity.ts';
+import { setupMusic, setupMusicHandlers } from './config/MusicConfig.ts';
+import { setupSFX } from './config/SFXConfig.ts';
+
+const canvas = document.getElementById('game-canvas') as HTMLCanvasElement;
+if (!canvas) {
+  console.error('Canvas element not found!');
+} else {
+  const engine = new Engine(canvas);
+
+  engine.addSystem(new MenuSystem(engine));
+  engine.addSystem(new InputSystem());
+  engine.addSystem(new MusicSystem());
+  engine.addSystem(new SoundEffectsSystem());
+  engine.addSystem(new CameraSystem());
+  engine.addSystem(new PlayerControllerSystem());
+  engine.addSystem(new StealthSystem());
+  engine.addSystem(new AISystem());
+  engine.addSystem(new MovementSystem());
+  engine.addSystem(new CombatSystem());
+  engine.addSystem(new ProjectileSystem());
+  engine.addSystem(new AbsorptionSystem());
+  engine.addSystem(new SkillSystem());
+  engine.addSystem(new SkillEffectSystem());
+  engine.addSystem(new HealthRegenerationSystem());
+  engine.addSystem(new DeathSystem());
+  engine.addSystem(new VFXSystem());
+  engine.addSystem(new RenderSystem(engine));
+  engine.addSystem(new UISystem(engine));
+
+  const player = engine.createEntity();
+  const startX = engine.tileMap ? (engine.tileMap.cols * engine.tileMap.tileSize) / 2 : 160;
+  const startY = engine.tileMap ? (engine.tileMap.rows * engine.tileMap.tileSize) / 2 : 120;
+  player.addComponent(new Position(startX, startY));
+  player.addComponent(new Velocity(0, 0));
+  player.addComponent(new Sprite('#00ff96', 14, 14, EntityType.SLIME));
+  player.addComponent(new Health(100));
+  player.addComponent(new Stats());
+  player.addComponent(new Evolution());
+
+  const playerSkills = new Skills();
+  playerSkills.addSkill('slime_gun', false);
+  player.addComponent(playerSkills);
+
+  player.addComponent(new Inventory());
+  player.addComponent(new Combat());
+  player.addComponent(new Stealth());
+  player.addComponent(new SkillProgress());
+  player.addComponent(new Intent());
+
+  const cameraEntity = engine.createEntity();
+  const camera = new Camera(canvas.width, canvas.height, 0.15);
+  if (engine.tileMap) {
+    const mapWidth = engine.tileMap.cols * engine.tileMap.tileSize;
+    const mapHeight = engine.tileMap.rows * engine.tileMap.tileSize;
+    camera.setBounds(mapWidth, mapHeight);
+    camera.x = startX;
+    camera.y = startY;
+  }
+  cameraEntity.addComponent(camera);
+
+  function createCreature(engine: Engine, x: number, y: number, type: EntityType): Entity {
+    const creature = engine.createEntity();
+    creature.addComponent(new Position(x, y));
+    creature.addComponent(new Velocity(0, 0));
+
+    let color: string;
+    let evolutionData: { human: number; beast: number; slime: number };
+    let skills: string[];
+
+    switch (type) {
+      case EntityType.HUMANOID:
+        color = '#ff5555';
+        evolutionData = { human: 10, beast: 0, slime: -2 };
+        skills = ['fire_breath'];
+        break;
+      case EntityType.BEAST:
+        color = '#ffaa00';
+        evolutionData = { human: 0, beast: 10, slime: -2 };
+        skills = ['pounce'];
+        break;
+      case EntityType.ELEMENTAL:
+        color = '#00bfff';
+        evolutionData = { human: 3, beast: 3, slime: 8 };
+        skills = ['fire_breath'];
+        break;
+      default:
+        color = '#888888';
+        evolutionData = { human: 2, beast: 2, slime: 2 };
+        skills = [];
+    }
+
+    creature.addComponent(new Sprite(color, 10, 10, type));
+    creature.addComponent(new Health(15 + Math.random() * 10));
+    creature.addComponent(new Stats());
+    creature.addComponent(new Combat());
+    creature.addComponent(new AI('wander'));
+    creature.addComponent(new Intent());
+
+    const absorbable = new Absorbable();
+    absorbable.setEvolutionData(evolutionData.human, evolutionData.beast, evolutionData.slime);
+    skills.forEach((skillId) => absorbable.addSkill(skillId, 0.3));
+    creature.addComponent(absorbable);
+
+    return creature;
+  }
+
+  const mapWidth = engine.tileMap ? engine.tileMap.cols * engine.tileMap.tileSize : 320;
+  const mapHeight = engine.tileMap ? engine.tileMap.rows * engine.tileMap.tileSize : 240;
+
+  function spawnEnemyNearPlayer(): void {
+    const playerPos = player.getComponent<Position>(ComponentType.POSITION);
+    if (!playerPos) return;
+
+    const spawnRadius = 150;
+    const minDistance = 80;
+    const maxAttempts = 10;
+
+    for (let attempt = 0; attempt < maxAttempts; attempt++) {
+      const angle = Math.random() * Math.PI * 2;
+      const distance = minDistance + Math.random() * (spawnRadius - minDistance);
+      const x = playerPos.x + Math.cos(angle) * distance;
+      const y = playerPos.y + Math.sin(angle) * distance;
+
+      if (x >= 50 && x <= mapWidth - 50 && y >= 50 && y <= mapHeight - 50) {
+        const types = [EntityType.HUMANOID, EntityType.BEAST, EntityType.ELEMENTAL];
+        const type = types[Math.floor(Math.random() * types.length)];
+        createCreature(engine, x, y, type);
+        return;
+      }
+    }
+  }
+
+  const numberOfEnemies = 20;
+
+  for (let i = 0; i < numberOfEnemies / 2; i++) {
+    spawnEnemyNearPlayer();
+  }
+
+  setInterval(() => {
+    const existingCreatures = engine
+      .getEntities()
+      .filter((e) => e.hasComponent(ComponentType.AI) && e !== player);
+
+    if (existingCreatures.length < numberOfEnemies) {
+      spawnEnemyNearPlayer();
+    }
+  }, 5000);
+
+  const musicSystem = engine.systems.find((s) => s.name === 'MusicSystem') as
+    | MusicSystem
+    | undefined;
+  if (musicSystem) {
+    const musicEntity = engine.createEntity();
+    const music = new Music();
+    const audioCtx = musicSystem.getAudioContext();
+
+    setupMusic(music, audioCtx);
+    musicEntity.addComponent(music);
+    setupMusicHandlers(music, musicSystem, canvas);
+
+    const sfxSystem = engine.systems.find((s) => s.name === 'SoundEffectsSystem') as
+      | SoundEffectsSystem
+      | undefined;
+    if (sfxSystem) {
+      const sfxEntity = engine.createEntity();
+      const sfx = new SoundEffects(audioCtx);
+      setupSFX(sfx, audioCtx);
+      sfxEntity.addComponent(sfx);
+    }
+  } else {
+    canvas.addEventListener('click', () => {
+      canvas.focus();
+    });
+  }
+
+  canvas.focus();
+  engine.start();
+
+  interface WindowWithGame {
+    gameEngine?: Engine;
+    player?: Entity;
+    music?: Music;
+  }
+  (window as WindowWithGame).gameEngine = engine;
+  (window as WindowWithGame).player = player;
+  if (musicSystem) {
+    const musicEntity = engine.getEntities().find((e) => e.hasComponent(ComponentType.MUSIC));
+    if (musicEntity) {
+      const music = musicEntity.getComponent<Music>(ComponentType.MUSIC);
+      if (music) {
+        (window as WindowWithGame).music = music;
+      }
+    }
+  }
+}

src/skills/Skill.js

@@ -1,32 +0,0 @@
-/**
- * Base Skill class
- */
-export class Skill {
-  constructor(id, name, cooldown = 2.0) {
-    this.id = id;
-    this.name = name;
-    this.cooldown = cooldown;
-    this.description = '';
-  }
-
-  /**
-     * Activate the skill
-     * @param {Entity} caster - Entity using the skill
-     * @param {Engine} engine - Game engine
-     * @returns {boolean} - Whether skill was successfully activated
-     */
-  activate(_caster, _engine) {
-    // Override in subclasses
-    return false;
-  }
-
-
-  /**
-     * Check if skill can be used
-     */
-  canUse(caster, _engine) {
-    const skills = caster.getComponent('Skills');
-    if (!skills) return false;
-    return !skills.isOnCooldown(this.id);
-  }
-}

src/skills/Skill.ts

@@ -0,0 +1,48 @@
+import type { Entity } from '../core/Entity.ts';
+import type { Engine } from '../core/Engine.ts';
+import { ComponentType } from '../core/Constants.ts';
+import type { Skills } from '../components/Skills.ts';
+
+/**
+ * Base class for all skills in the game.
+ */
+export class Skill {
+  id: string;
+  name: string;
+  cooldown: number;
+  description: string;
+
+  /**
+   * @param id - Unique identifier for the skill
+   * @param name - Display name of the skill
+   * @param cooldown - Cooldown duration in seconds
+   */
+  constructor(id: string, name: string, cooldown = 2.0) {
+    this.id = id;
+    this.name = name;
+    this.cooldown = cooldown;
+    this.description = '';
+  }
+
+  /**
+   * Activate the skill's effects.
+   * @param _caster - Entity using the skill
+   * @param _engine - Game engine
+   * @returns Whether skill was successfully activated
+   */
+  activate(_caster: Entity, _engine: Engine): boolean {
+    return false;
+  }
+
+  /**
+   * Check if the skill can be used by the caster.
+   * @param caster - The caster entity
+   * @param _engine - Game engine
+   * @returns True if the skill is not on cooldown
+   */
+  canUse(caster: Entity, _engine: Engine): boolean {
+    const skills = caster.getComponent<Skills>(ComponentType.SKILLS);
+    if (!skills) return false;
+    return !skills.isOnCooldown(this.id);
+  }
+}

src/skills/SkillRegistry.js

@@ -1,36 +0,0 @@
-import { SlimeGun } from './skills/WaterGun.js'; // File still named WaterGun.js but class is SlimeGun
-import { FireBreath } from './skills/FireBreath.js';
-import { Pounce } from './skills/Pounce.js';
-import { StealthMode } from './skills/StealthMode.js';
-
-/**
- * Registry for all skills in the game
- */
-export class SkillRegistry {
-  static skills = new Map();
-
-  static {
-    // Register all skills
-    this.register(new SlimeGun());
-    this.register(new FireBreath());
-    this.register(new Pounce());
-    this.register(new StealthMode());
-  }
-
-  static register(skill) {
-    this.skills.set(skill.id, skill);
-  }
-
-  static get(id) {
-    return this.skills.get(id);
-  }
-
-  static getAll() {
-    return Array.from(this.skills.values());
-  }
-
-  static has(id) {
-    return this.skills.has(id);
-  }
-}
-

src/skills/SkillRegistry.ts

@@ -0,0 +1,53 @@
+import { SlimeGun } from './skills/WaterGun.ts';
+import { FireBreath } from './skills/FireBreath.ts';
+import { Pounce } from './skills/Pounce.ts';
+import { StealthMode } from './skills/StealthMode.ts';
+import type { Skill } from './Skill.ts';
+
+/**
+ * Static registry responsible for storing and retrieving all available skills.
+ */
+export class SkillRegistry {
+  static skills = new Map<string, Skill>();
+
+  static {
+    this.register(new SlimeGun());
+    this.register(new FireBreath());
+    this.register(new Pounce());
+    this.register(new StealthMode());
+  }
+
+  /**
+   * Register a skill instance in the registry.
+   * @param skill - The skill instance to register
+   */
+  static register(skill: Skill): void {
+    this.skills.set(skill.id, skill);
+  }
+
+  /**
+   * Retrieve a skill instance by its unique ID.
+   * @param id - The skill identifier
+   * @returns The skill instance or undefined if not found
+   */
+  static get(id: string): Skill | undefined {
+    return this.skills.get(id);
+  }
+
+  /**
+   * Get an array of all registered skills.
+   * @returns Array of all skills
+   */
+  static getAll(): Skill[] {
+    return Array.from(this.skills.values());
+  }
+
+  /**
+   * Check if a skill ID is registered.
+   * @param id - The skill identifier
+   * @returns True if the skill exists in the registry
+   */
+  static has(id: string): boolean {
+    return this.skills.has(id);
+  }
+}

src/skills/skills/FireBreath.js

@@ -1,83 +0,0 @@
-import { Skill } from '../Skill.js';
-
-export class FireBreath extends Skill {
-  constructor() {
-    super('fire_breath', 'Fire Breath', 3.0);
-    this.description = 'Breathe fire in a cone';
-    this.damage = 25;
-    this.range = 150;
-    this.coneAngle = Math.PI / 3; // 60 degrees
-    this.duration = 0.5; // Animation duration
-  }
-
-  activate(caster, engine) {
-    if (!this.canUse(caster, engine)) return false;
-
-    const position = caster.getComponent('Position');
-    const stats = caster.getComponent('Stats');
-    const skills = caster.getComponent('Skills');
-    const inputSystem = engine.systems.find(s => s.name === 'InputSystem');
-
-    if (!position || !skills) return false;
-
-    // Calculate direction from player to mouse
-    let fireAngle = position.rotation;
-    if (inputSystem) {
-      const mouse = inputSystem.getMousePosition();
-      const dx = mouse.x - position.x;
-      const dy = mouse.y - position.y;
-      if (Math.abs(dx) > 0.1 || Math.abs(dy) > 0.1) {
-        fireAngle = Math.atan2(dy, dx);
-        position.rotation = fireAngle;
-      }
-    }
-
-    skills.setCooldown(this.id, this.cooldown);
-
-    // Add visual effect
-    const skillEffectSystem = engine.systems.find(s => s.name === 'SkillEffectSystem');
-    if (skillEffectSystem) {
-      skillEffectSystem.addEffect({
-        type: 'fire_breath',
-        x: position.x,
-        y: position.y,
-        angle: fireAngle,
-        range: this.range,
-        coneAngle: this.coneAngle,
-        lifetime: this.duration,
-        time: 0
-      });
-    }
-
-    // Damage all enemies in cone
-    const entities = engine.getEntities();
-    const damage = this.damage + (stats ? stats.intelligence * 0.5 : 0);
-
-    entities.forEach(entity => {
-      if (entity.id === caster.id) return;
-      if (!entity.hasComponent('Health')) return;
-
-      const targetPos = entity.getComponent('Position');
-      if (!targetPos) return;
-
-      const dx = targetPos.x - position.x;
-      const dy = targetPos.y - position.y;
-      const distance = Math.sqrt(dx * dx + dy * dy);
-
-      if (distance <= this.range) {
-        const angle = Math.atan2(dy, dx);
-        const angleDiff = Math.abs(angle - fireAngle);
-        const normalizedDiff = Math.abs(((angleDiff % (Math.PI * 2)) + Math.PI * 2) % (Math.PI * 2));
-        const minDiff = Math.min(normalizedDiff, Math.PI * 2 - normalizedDiff);
-
-        if (minDiff < this.coneAngle / 2) {
-          const health = entity.getComponent('Health');
-          health.takeDamage(damage);
-        }
-      }
-    });
-
-    return true;
-  }
-}
-

src/skills/skills/FireBreath.ts

@@ -0,0 +1,110 @@
+import { Skill } from '../Skill.ts';
+import { ComponentType, SystemName } from '../../core/Constants.ts';
+import type { Entity } from '../../core/Entity.ts';
+import type { Engine } from '../../core/Engine.ts';
+import type { Position } from '../../components/Position.ts';
+import type { Stats } from '../../components/Stats.ts';
+import type { Skills } from '../../components/Skills.ts';
+import type { Health } from '../../components/Health.ts';
+import type { InputSystem } from '../../systems/InputSystem.ts';
+import type { SkillEffectSystem } from '../../systems/SkillEffectSystem.ts';
+
+/**
+ * Skill that deals damage in a cone-shaped area in front of the caster.
+ */
+export class FireBreath extends Skill {
+  damage: number;
+  range: number;
+  coneAngle: number;
+  duration: number;
+
+  constructor() {
+    super('fire_breath', 'Fire Breath', 3.0);
+    this.description = 'Breathe fire in a cone';
+    this.damage = 25;
+    this.range = 80;
+    this.coneAngle = Math.PI / 3;
+    this.duration = 0.5;
+  }
+
+  /**
+   * Activate the fire breath effect, damaging enemies within the cone.
+   * @param caster - The caster entity
+   * @param engine - The game engine
+   * @returns True if the skill was activated
+   */
+  activate(caster: Entity, engine: Engine): boolean {
+    if (!this.canUse(caster, engine)) return false;
+
+    const position = caster.getComponent<Position>(ComponentType.POSITION);
+    const stats = caster.getComponent<Stats>(ComponentType.STATS);
+    const skills = caster.getComponent<Skills>(ComponentType.SKILLS);
+    const inputSystem = engine.systems.find((s) => s.name === SystemName.INPUT) as
+      | InputSystem
+      | undefined;
+
+    if (!position || !skills) return false;
+
+    let fireAngle = position.rotation;
+    if (inputSystem) {
+      const mouse = inputSystem.getMousePosition();
+      const dx = mouse.x - position.x;
+      const dy = mouse.y - position.y;
+      if (Math.abs(dx) > 0.1 || Math.abs(dy) > 0.1) {
+        fireAngle = Math.atan2(dy, dx);
+        position.rotation = fireAngle;
+      }
+    }
+
+    skills.setCooldown(this.id, this.cooldown);
+
+    const skillEffectSystem = engine.systems.find((s) => s.name === SystemName.SKILL_EFFECT) as
+      | SkillEffectSystem
+      | undefined;
+    if (skillEffectSystem) {
+      skillEffectSystem.addEffect({
+        type: 'fire_breath',
+        x: position.x,
+        y: position.y,
+        angle: fireAngle,
+        range: this.range,
+        coneAngle: this.coneAngle,
+        lifetime: this.duration,
+        time: 0,
+      });
+    }
+
+    const entities = engine.getEntities();
+    const damage = this.damage + (stats ? stats.intelligence * 0.5 : 0);
+
+    entities.forEach((entity) => {
+      if (entity.id === caster.id) return;
+      if (!entity.hasComponent(ComponentType.HEALTH)) return;
+
+      const targetPos = entity.getComponent<Position>(ComponentType.POSITION);
+      if (!targetPos) return;
+
+      const dx = targetPos.x - position.x;
+      const dy = targetPos.y - position.y;
+      const distance = Math.sqrt(dx * dx + dy * dy);
+
+      if (distance <= this.range) {
+        const angle = Math.atan2(dy, dx);
+        const angleDiff = Math.abs(angle - fireAngle);
+        const normalizedDiff = Math.abs(
+          ((angleDiff % (Math.PI * 2)) + Math.PI * 2) % (Math.PI * 2)
+        );
+        const minDiff = Math.min(normalizedDiff, Math.PI * 2 - normalizedDiff);
+
+        if (minDiff < this.coneAngle / 2) {
+          const health = entity.getComponent<Health>(ComponentType.HEALTH);
+          if (health) {
+            health.takeDamage(damage);
+          }
+        }
+      }
+    });
+
+    return true;
+  }
+}

src/skills/skills/Pounce.js

@@ -1,97 +0,0 @@
-import { Skill } from '../Skill.js';
-
-export class Pounce extends Skill {
-  constructor() {
-    super('pounce', 'Pounce', 2.0);
-    this.description = 'Leap forward and damage enemies';
-    this.damage = 20;
-    this.range = 100;
-    this.dashSpeed = 400;
-    this.dashDuration = 0.2; // How long the dash lasts
-  }
-
-  activate(caster, engine) {
-    if (!this.canUse(caster, engine)) return false;
-
-    const position = caster.getComponent('Position');
-    const velocity = caster.getComponent('Velocity');
-    const stats = caster.getComponent('Stats');
-    const skills = caster.getComponent('Skills');
-    const inputSystem = engine.systems.find(s => s.name === 'InputSystem');
-
-    if (!position || !velocity || !skills) return false;
-
-    // Calculate direction from player to mouse
-    let dashAngle = position.rotation;
-    if (inputSystem) {
-      const mouse = inputSystem.getMousePosition();
-      const dx = mouse.x - position.x;
-      const dy = mouse.y - position.y;
-      if (Math.abs(dx) > 0.1 || Math.abs(dy) > 0.1) {
-        dashAngle = Math.atan2(dy, dx);
-        position.rotation = dashAngle;
-      }
-    }
-
-    skills.setCooldown(this.id, this.cooldown);
-
-    // Store start position for effect
-    const startX = position.x;
-    const startY = position.y;
-
-    // Dash forward
-    velocity.vx = Math.cos(dashAngle) * this.dashSpeed;
-    velocity.vy = Math.sin(dashAngle) * this.dashSpeed;
-
-    // Add visual effect
-    const skillEffectSystem = engine.systems.find(s => s.name === 'SkillEffectSystem');
-    if (skillEffectSystem) {
-      skillEffectSystem.addEffect({
-        type: 'pounce',
-        startX: startX,
-        startY: startY,
-        angle: dashAngle,
-        speed: this.dashSpeed,
-        lifetime: this.dashDuration,
-        time: 0
-      });
-    }
-
-    // Damage enemies at destination after dash
-    setTimeout(() => {
-      const entities = engine.getEntities();
-      const damage = this.damage + (stats ? stats.strength * 0.4 : 0);
-
-      entities.forEach(entity => {
-        if (entity.id === caster.id) return;
-        if (!entity.hasComponent('Health')) return;
-
-        const targetPos = entity.getComponent('Position');
-        if (!targetPos) return;
-
-        const dx = targetPos.x - position.x;
-        const dy = targetPos.y - position.y;
-        const distance = Math.sqrt(dx * dx + dy * dy);
-
-        if (distance <= this.range) {
-          const health = entity.getComponent('Health');
-          health.takeDamage(damage);
-                    
-          // Add impact effect
-          if (skillEffectSystem) {
-            skillEffectSystem.addEffect({
-              type: 'pounce_impact',
-              x: position.x,
-              y: position.y,
-              lifetime: 0.3,
-              time: 0
-            });
-          }
-        }
-      });
-    }, this.dashDuration * 1000);
-
-    return true;
-  }
-}
-

src/skills/skills/Pounce.ts

@@ -0,0 +1,161 @@
+import { Skill } from '../Skill.ts';
+import { ComponentType, SystemName } from '../../core/Constants.ts';
+import type { Entity } from '../../core/Entity.ts';
+import type { Engine } from '../../core/Engine.ts';
+import type { Position } from '../../components/Position.ts';
+import type { Velocity } from '../../components/Velocity.ts';
+import type { Sprite } from '../../components/Sprite.ts';
+import type { Stats } from '../../components/Stats.ts';
+import type { Skills } from '../../components/Skills.ts';
+import type { Health } from '../../components/Health.ts';
+import type { InputSystem } from '../../systems/InputSystem.ts';
+import type { SkillEffectSystem, SkillEffect } from '../../systems/SkillEffectSystem.ts';
+
+/**
+ * Skill that allows the caster to leap forward, dealing damage and knockback upon landing.
+ */
+export class Pounce extends Skill {
+  damage: number;
+  range: number;
+  dashSpeed: number;
+  dashDuration: number;
+
+  constructor() {
+    super('pounce', 'Pounce', 2.0);
+    this.description = 'Leap forward and damage enemies';
+    this.damage = 25;
+    this.range = 30;
+    this.dashSpeed = 300;
+    this.dashDuration = 0.2;
+  }
+
+  /**
+   * Activate the pounce leap, setting velocity and adding visual effects.
+   * @param caster - The caster entity
+   * @param engine - The game engine
+   * @returns True if the skill was activated
+   */
+  activate(caster: Entity, engine: Engine): boolean {
+    if (!this.canUse(caster, engine)) return false;
+
+    const position = caster.getComponent<Position>(ComponentType.POSITION);
+    const velocity = caster.getComponent<Velocity>(ComponentType.VELOCITY);
+    const sprite = caster.getComponent<Sprite>(ComponentType.SPRITE);
+    const skills = caster.getComponent<Skills>(ComponentType.SKILLS);
+    const inputSystem = engine.systems.find((s) => s.name === SystemName.INPUT) as
+      | InputSystem
+      | undefined;
+
+    if (!position || !velocity || !skills) return false;
+
+    let dashAngle = position.rotation;
+    if (inputSystem) {
+      const mouse = inputSystem.getMousePosition();
+      const dx = mouse.x - position.x;
+      const dy = mouse.y - position.y;
+      if (Math.abs(dx) > 1 || Math.abs(dy) > 1) {
+        dashAngle = Math.atan2(dy, dx);
+        position.rotation = dashAngle;
+      }
+    }
+
+    skills.setCooldown(this.id, this.cooldown);
+
+    velocity.isLocked = true;
+    velocity.lockTimer = this.dashDuration;
+
+    velocity.vx = Math.cos(dashAngle) * this.dashSpeed;
+    velocity.vy = Math.sin(dashAngle) * this.dashSpeed;
+
+    const skillEffectSystem = engine.systems.find((s) => s.name === SystemName.SKILL_EFFECT) as
+      | SkillEffectSystem
+      | undefined;
+    if (skillEffectSystem) {
+      skillEffectSystem.addEffect({
+        type: 'pounce',
+        caster: caster,
+        startX: position.x,
+        startY: position.y,
+        angle: dashAngle,
+        lifetime: this.dashDuration,
+        time: 0,
+        onUpdate: (_deltaTime: number) => {
+          const effects = skillEffectSystem.getEffects();
+          const effect = effects.find(
+            (e: SkillEffect) => e.caster === caster && e.type === 'pounce'
+          );
+          if (!effect) return;
+
+          const progress = effect.time / effect.lifetime;
+          const jumpHeight = 15;
+          if (sprite) {
+            sprite.yOffset = -Math.sin(Math.PI * progress) * jumpHeight;
+            sprite.scale = 1.0 + Math.sin(Math.PI * progress) * 0.4;
+          }
+        },
+        onComplete: () => {
+          this.triggerImpact(caster, engine);
+          if (sprite) {
+            sprite.yOffset = 0;
+            sprite.scale = 1.0;
+          }
+        },
+      });
+    }
+
+    return true;
+  }
+
+  /**
+   * Execute the impact damage and knockback upon landing.
+   * @param caster - The caster entity
+   * @param engine - The game engine
+   */
+  triggerImpact(caster: Entity, engine: Engine): void {
+    const position = caster.getComponent<Position>(ComponentType.POSITION);
+    const stats = caster.getComponent<Stats>(ComponentType.STATS);
+    if (!position) return;
+
+    const skillEffectSystem = engine.systems.find((s) => s.name === SystemName.SKILL_EFFECT) as
+      | SkillEffectSystem
+      | undefined;
+    if (skillEffectSystem) {
+      skillEffectSystem.addEffect({
+        type: 'pounce_impact',
+        x: position.x,
+        y: position.y,
+        lifetime: 0.3,
+        time: 0,
+      });
+    }
+
+    const damage = this.damage + (stats ? stats.strength * 0.5 : 0);
+    const entities = engine.getEntities();
+
+    entities.forEach((entity) => {
+      if (entity === caster) return;
+      if (!entity.hasComponent(ComponentType.HEALTH)) return;
+
+      const targetPos = entity.getComponent<Position>(ComponentType.POSITION);
+      if (!targetPos) return;
+
+      const dx = targetPos.x - position.x;
+      const dy = targetPos.y - position.y;
+      const distance = Math.sqrt(dx * dx + dy * dy);
+
+      if (distance <= this.range) {
+        const health = entity.getComponent<Health>(ComponentType.HEALTH);
+        if (health) {
+          health.takeDamage(damage);
+        }
+
+        const targetVel = entity.getComponent<Velocity>(ComponentType.VELOCITY);
+        if (targetVel) {
+          const angle = Math.atan2(dy, dx);
+          targetVel.vx += Math.cos(angle) * 150;
+          targetVel.vy += Math.sin(angle) * 150;
+        }
+      }
+    });
+  }
+}

src/skills/skills/StealthMode.js

@@ -1,35 +0,0 @@
-import { Skill } from '../Skill.js';
-
-export class StealthMode extends Skill {
-  constructor() {
-    super('stealth_mode', 'Stealth Mode', 5.0);
-    this.description = 'Enter stealth mode';
-    this.duration = 10.0;
-  }
-
-  activate(caster, engine) {
-    if (!this.canUse(caster, engine)) return false;
-
-    const stealth = caster.getComponent('Stealth');
-    const skills = caster.getComponent('Skills');
-    const evolution = caster.getComponent('Evolution');
-
-    if (!stealth || !skills) return false;
-
-    skills.setCooldown(this.id, this.cooldown);
-
-    // Determine stealth type from evolution
-    const form = evolution ? evolution.getDominantForm() : 'slime';
-    stealth.enterStealth(form);
-
-    // Auto-exit after duration
-    setTimeout(() => {
-      if (stealth.isStealthed) {
-        stealth.exitStealth();
-      }
-    }, this.duration * 1000);
-
-    return true;
-  }
-}
-

src/skills/skills/StealthMode.ts

@@ -0,0 +1,49 @@
+import { Skill } from '../Skill.ts';
+import { ComponentType } from '../../core/Constants.ts';
+import type { Entity } from '../../core/Entity.ts';
+import type { Engine } from '../../core/Engine.ts';
+import type { Stealth } from '../../components/Stealth.ts';
+import type { Skills } from '../../components/Skills.ts';
+import type { Evolution } from '../../components/Evolution.ts';
+
+/**
+ * Skill that allows the caster to enter a stealthed state, reducing visibility.
+ */
+export class StealthMode extends Skill {
+  duration: number;
+
+  constructor() {
+    super('stealth_mode', 'Stealth Mode', 5.0);
+    this.description = 'Enter stealth mode';
+    this.duration = 10.0;
+  }
+
+  /**
+   * Activate stealth mode, applying form-based stealth to the caster.
+   * @param caster - The caster entity
+   * @param _engine - The game engine
+   * @returns True if the skill was activated
+   */
+  activate(caster: Entity, _engine: Engine): boolean {
+    if (!this.canUse(caster, _engine)) return false;
+
+    const stealth = caster.getComponent<Stealth>(ComponentType.STEALTH);
+    const skills = caster.getComponent<Skills>(ComponentType.SKILLS);
+    const evolution = caster.getComponent<Evolution>(ComponentType.EVOLUTION);
+
+    if (!stealth || !skills) return false;
+
+    skills.setCooldown(this.id, this.cooldown);
+
+    const form = evolution ? evolution.getDominantForm() : 'slime';
+    stealth.enterStealth(form);
+
+    setTimeout(() => {
+      if (stealth.isStealthed) {
+        stealth.exitStealth();
+      }
+    }, this.duration * 1000);
+
+    return true;
+  }
+}

src/skills/skills/WaterGun.js

@@ -1,84 +0,0 @@
-import { Skill } from '../Skill.js';
-import { Position } from '../../components/Position.js';
-import { Velocity } from '../../components/Velocity.js';
-import { Sprite } from '../../components/Sprite.js';
-import { Health } from '../../components/Health.js';
-
-export class SlimeGun extends Skill {
-  constructor() {
-    super('slime_gun', 'Slime Gun', 1.0);
-    this.description = 'Shoot a blob of slime at enemies (costs 1 HP)';
-    this.damage = 15;
-    this.range = 800; // Long range for a gun
-    this.speed = 600; // Faster projectile
-    this.hpCost = 1;
-  }
-
-  activate(caster, engine) {
-    if (!this.canUse(caster, engine)) return false;
-
-    const position = caster.getComponent('Position');
-    const health = caster.getComponent('Health');
-    const stats = caster.getComponent('Stats');
-    const skills = caster.getComponent('Skills');
-    const inputSystem = engine.systems.find(s => s.name === 'InputSystem');
-
-    if (!position || !skills || !health) return false;
-
-    // Check if we have enough HP
-    if (health.hp <= this.hpCost) {
-      return false; // Can't use if it would kill us
-    }
-
-    // Calculate direction from player to mouse
-    let shootAngle = position.rotation;
-    if (inputSystem) {
-      const mouse = inputSystem.getMousePosition();
-      const dx = mouse.x - position.x;
-      const dy = mouse.y - position.y;
-      if (Math.abs(dx) > 0.1 || Math.abs(dy) > 0.1) {
-        shootAngle = Math.atan2(dy, dx);
-      }
-    }
-
-    // Cost HP (sacrificing slime)
-    health.takeDamage(this.hpCost);
-
-    // Set cooldown
-    skills.setCooldown(this.id, this.cooldown);
-
-    // Create projectile (slime blob)
-    const projectile = engine.createEntity();
-    const startX = position.x;
-    const startY = position.y;
-    projectile.addComponent(new Position(startX, startY));
-        
-    // Create velocity with high maxSpeed for projectiles
-    const projectileVelocity = new Velocity(
-      Math.cos(shootAngle) * this.speed,
-      Math.sin(shootAngle) * this.speed
-    );
-    projectileVelocity.maxSpeed = this.speed * 2; // Allow projectiles to move fast
-    projectile.addComponent(projectileVelocity);
-    // Slime-colored projectile
-    projectile.addComponent(new Sprite('#00ff96', 10, 10, 'slime'));
-        
-    // Projectile has temporary health for collision detection
-    const projectileHealth = new Health(1);
-    projectileHealth.isProjectile = true;
-    projectile.addComponent(projectileHealth);
-
-    // Store projectile data
-    projectile.damage = this.damage + (stats ? stats.intelligence * 0.3 : 0);
-    projectile.owner = caster.id;
-    projectile.startX = startX;
-    projectile.startY = startY;
-    projectile.maxRange = this.range;
-    projectile.speed = this.speed;
-    // Lifetime as backup (should be longer than range travel time)
-    projectile.lifetime = (this.range / this.speed) + 1.0;
-
-    return true;
-  }
-}
-

src/skills/skills/WaterGun.ts

@@ -0,0 +1,101 @@
+import { Skill } from '../Skill.ts';
+import { ComponentType, SystemName, EntityType } from '../../core/Constants.ts';
+import { Events } from '../../core/EventBus.ts';
+import { Position } from '../../components/Position.ts';
+import { Velocity } from '../../components/Velocity.ts';
+import { Sprite } from '../../components/Sprite.ts';
+import { Health } from '../../components/Health.ts';
+import type { Entity } from '../../core/Entity.ts';
+import type { Engine } from '../../core/Engine.ts';
+import type { Stats } from '../../components/Stats.ts';
+import type { Skills } from '../../components/Skills.ts';
+import type { InputSystem } from '../../systems/InputSystem.ts';
+
+/**
+ * Skill that fires a projectile, costing health but dealing ranged damage.
+ */
+export class SlimeGun extends Skill {
+  damage: number;
+  range: number;
+  speed: number;
+  hpCost: number;
+
+  constructor() {
+    super('slime_gun', 'Slime Gun', 1.0);
+    this.description = 'Shoot a blob of slime at enemies (costs 1 HP)';
+    this.damage = 15;
+    this.range = 250;
+    this.speed = 250;
+    this.hpCost = 1;
+  }
+
+  /**
+   * Activate the slime gun, sacrificing health to create a projectile.
+   * @param caster - The caster entity
+   * @param engine - The game engine
+   * @returns True if the projectile was successfully created
+   */
+  activate(caster: Entity, engine: Engine): boolean {
+    if (!this.canUse(caster, engine)) return false;
+
+    const position = caster.getComponent<Position>(ComponentType.POSITION);
+    const health = caster.getComponent<Health>(ComponentType.HEALTH);
+    const stats = caster.getComponent<Stats>(ComponentType.STATS);
+    const skills = caster.getComponent<Skills>(ComponentType.SKILLS);
+    const inputSystem = engine.systems.find((s) => s.name === SystemName.INPUT) as
+      | InputSystem
+      | undefined;
+
+    if (!position || !skills || !health) return false;
+
+    if (health.hp <= this.hpCost) {
+      return false;
+    }
+
+    let shootAngle = position.rotation;
+    if (inputSystem) {
+      const mouse = inputSystem.getMousePosition();
+      const dx = mouse.x - position.x;
+      const dy = mouse.y - position.y;
+      if (Math.abs(dx) > 0.1 || Math.abs(dy) > 0.1) {
+        shootAngle = Math.atan2(dy, dx);
+      }
+    }
+
+    health.takeDamage(this.hpCost);
+    skills.setCooldown(this.id, this.cooldown);
+
+    const projectile = engine.createEntity();
+    const startX = position.x;
+    const startY = position.y;
+    projectile.addComponent(new Position(startX, startY));
+
+    const projectileVelocity = new Velocity(
+      Math.cos(shootAngle) * this.speed,
+      Math.sin(shootAngle) * this.speed
+    );
+    projectileVelocity.maxSpeed = this.speed * 2;
+    projectile.addComponent(projectileVelocity);
+
+    projectile.addComponent(new Sprite('#00ff96', 4, 4, EntityType.PROJECTILE));
+
+    const projectileHealth = new Health(1);
+    projectileHealth.isProjectile = true;
+    projectile.addComponent(projectileHealth);
+
+    projectile.damage = this.damage + (stats ? stats.intelligence * 0.3 : 0);
+    projectile.owner = caster.id;
+    projectile.startX = startX;
+    projectile.startY = startY;
+    projectile.maxRange = this.range;
+    projectile.lifetime = this.range / this.speed + 1.0;
+
+    engine.emit(Events.PROJECTILE_CREATED, {
+      x: startX,
+      y: startY,
+      angle: shootAngle,
+    });
+
+    return true;
+  }
+}

src/systems/AISystem.js

@@ -1,205 +0,0 @@
-import { System } from '../core/System.js';
-import { GameConfig } from '../GameConfig.js';
-
-export class AISystem extends System {
-  constructor() {
-    super('AISystem');
-    this.requiredComponents = ['Position', 'Velocity', 'AI'];
-    this.priority = 15;
-  }
-
-  process(deltaTime, entities) {
-    const playerController = this.engine.systems.find(s => s.name === 'PlayerControllerSystem');
-    const player = playerController ? playerController.getPlayerEntity() : null;
-    const playerPos = player?.getComponent('Position');
-    const config = GameConfig.AI;
-
-    entities.forEach(entity => {
-      const ai = entity.getComponent('AI');
-      const position = entity.getComponent('Position');
-      const velocity = entity.getComponent('Velocity');
-      const _stealth = entity.getComponent('Stealth');
-
-      if (!ai || !position || !velocity) return;
-
-      // Update wander timer
-      ai.wanderChangeTime += deltaTime;
-
-      // Detect player
-      if (playerPos) {
-        const dx = playerPos.x - position.x;
-        const dy = playerPos.y - position.y;
-        const distance = Math.sqrt(dx * dx + dy * dy);
-
-        // Update awareness based on distance and player stealth
-        const playerStealth = player?.getComponent('Stealth');
-        const playerVisibility = playerStealth ? playerStealth.visibility : 1.0;
-
-        if (distance < ai.alertRadius) {
-          const detectionChance = (1 - distance / ai.alertRadius) * playerVisibility;
-          ai.updateAwareness(detectionChance * deltaTime * config.awarenessGainMultiplier);
-        } else {
-          ai.updateAwareness(-deltaTime * config.awarenessLossRate); // Lose awareness over time
-        }
-
-        // Biological Reputation Logic
-        const playerEvolution = player?.getComponent('Evolution');
-        const playerForm = playerEvolution ? playerEvolution.getDominantForm() : 'slime';
-        const entityType = entity.getComponent('Sprite')?.color === '#ffaa00' ? 'beast' :
-          entity.getComponent('Sprite')?.color === '#ff5555' ? 'humanoid' : 'other';
-
-        // Check if player is "one of us" or "too scary"
-        let isPassive = false;
-        let shouldFlee = false;
-
-        if (entityType === 'humanoid' && playerForm === 'human') {
-          // Humanoids are passive to human-form slime unless awareness is maxed (hostile action taken)
-          if (ai.awareness < config.passiveAwarenessThreshold) isPassive = true;
-        } else if (entityType === 'beast' && playerForm === 'beast') {
-          // Beasts might flee from a dominant beast player
-          const playerStats = player?.getComponent('Stats');
-          const entityStats = entity.getComponent('Stats');
-          if (playerStats && entityStats && playerStats.level > entityStats.level) {
-            shouldFlee = true;
-          }
-        }
-
-        // Behavior based on awareness, reputation, and distance
-        if (shouldFlee && ai.awareness > config.fleeAwarenessThreshold) {
-          ai.setBehavior('flee');
-          ai.state = 'fleeing';
-          ai.setTarget(player.id);
-        } else if (isPassive) {
-          if (ai.behaviorType === 'chase' || ai.behaviorType === 'combat') {
-            ai.setBehavior('wander');
-            ai.state = 'idle';
-            ai.clearTarget();
-          }
-        } else if (ai.awareness > config.detectionAwarenessThreshold && distance < ai.chaseRadius) {
-          if (ai.behaviorType !== 'flee') {
-            // Check if in attack range - if so, use combat behavior
-            const combat = entity.getComponent('Combat');
-            if (combat && distance <= combat.attackRange) {
-              ai.setBehavior('combat');
-              ai.state = 'combat';
-            } else {
-              ai.setBehavior('chase');
-              ai.state = 'chasing';
-            }
-            ai.setTarget(player.id);
-          }
-        } else if (ai.awareness < 0.3) {
-          if (ai.behaviorType === 'chase' || ai.behaviorType === 'combat') {
-            ai.setBehavior('wander');
-            ai.state = 'idle';
-            ai.clearTarget();
-          }
-        } else if (ai.behaviorType === 'chase') {
-          // Update from chase to combat if in range
-          const combat = entity.getComponent('Combat');
-          if (combat && distance <= combat.attackRange) {
-            ai.setBehavior('combat');
-            ai.state = 'combat';
-          }
-        }
-      }
-
-      // Execute behavior
-      switch (ai.behaviorType) {
-      case 'wander':
-        this.wander(entity, ai, velocity, deltaTime);
-        break;
-      case 'chase':
-        this.chase(entity, ai, velocity, position, playerPos);
-        break;
-      case 'flee':
-        this.flee(entity, ai, velocity, position, playerPos);
-        break;
-      case 'combat':
-        this.combat(entity, ai, velocity, position, playerPos);
-        break;
-      }
-    });
-  }
-
-  wander(entity, ai, velocity, _deltaTime) {
-    ai.state = 'moving';
-
-    // Change direction periodically
-    if (ai.wanderChangeTime >= ai.wanderChangeInterval) {
-      ai.wanderDirection = Math.random() * Math.PI * 2;
-      ai.wanderChangeTime = 0;
-      ai.wanderChangeInterval = 1 + Math.random() * 2;
-    }
-
-    velocity.vx = Math.cos(ai.wanderDirection) * ai.wanderSpeed;
-    velocity.vy = Math.sin(ai.wanderDirection) * ai.wanderSpeed;
-  }
-
-  chase(entity, ai, velocity, position, targetPos) {
-    if (!targetPos) return;
-
-    const dx = targetPos.x - position.x;
-    const dy = targetPos.y - position.y;
-    const distance = Math.sqrt(dx * dx + dy * dy);
-
-    // Check if we should switch to combat
-    const combat = entity.getComponent('Combat');
-    if (combat && distance <= combat.attackRange) {
-      ai.setBehavior('combat');
-      ai.state = 'combat';
-      return;
-    }
-
-    ai.state = 'chasing';
-    if (distance > 0.1) {
-      const speed = ai.wanderSpeed * 1.5;
-      velocity.vx = (dx / distance) * speed;
-      velocity.vy = (dy / distance) * speed;
-    } else {
-      velocity.vx = 0;
-      velocity.vy = 0;
-    }
-  }
-
-  flee(entity, ai, velocity, position, targetPos) {
-    if (!targetPos) return;
-
-    ai.state = 'fleeing';
-    const dx = position.x - targetPos.x;
-    const dy = position.y - targetPos.y;
-    const distance = Math.sqrt(dx * dx + dy * dy);
-
-    if (distance > 0.1) {
-      const speed = ai.wanderSpeed * 1.2;
-      velocity.vx = (dx / distance) * speed;
-      velocity.vy = (dy / distance) * speed;
-    }
-  }
-
-  combat(entity, ai, velocity, position, targetPos) {
-    if (!targetPos) return;
-
-    ai.state = 'attacking';
-    // Stop moving when in combat range - let CombatSystem handle attacks
-    const dx = targetPos.x - position.x;
-    const dy = targetPos.y - position.y;
-    const distance = Math.sqrt(dx * dx + dy * dy);
-
-    const combat = entity.getComponent('Combat');
-    if (combat && distance > combat.attackRange) {
-      // Move closer if out of range
-      const speed = ai.wanderSpeed;
-      velocity.vx = (dx / distance) * speed;
-      velocity.vy = (dy / distance) * speed;
-    } else {
-      // Stop and face target
-      velocity.vx *= 0.5;
-      velocity.vy *= 0.5;
-      if (position) {
-        position.rotation = Math.atan2(dy, dx);
-      }
-    }
-  }
-}
-

src/systems/AISystem.ts

@@ -0,0 +1,256 @@
+import { System } from '../core/System.ts';
+import { GameConfig } from '../GameConfig.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Health } from '../components/Health.ts';
+import type { AI } from '../components/AI.ts';
+import type { Position } from '../components/Position.ts';
+import type { Velocity } from '../components/Velocity.ts';
+import type { Stealth } from '../components/Stealth.ts';
+import type { Evolution } from '../components/Evolution.ts';
+import type { Sprite } from '../components/Sprite.ts';
+import type { Stats } from '../components/Stats.ts';
+import type { Combat } from '../components/Combat.ts';
+import type { Intent } from '../components/Intent.ts';
+import type { PlayerControllerSystem } from './PlayerControllerSystem.ts';
+
+/**
+ * System responsible for managing AI behaviors (wandering, chasing, fleeing, combat).
+ */
+export class AISystem extends System {
+  constructor() {
+    super(SystemName.AI);
+    this.requiredComponents = [ComponentType.POSITION, ComponentType.VELOCITY, ComponentType.AI];
+    this.priority = 15;
+  }
+
+  /**
+   * Process AI logic for all entities with an AI component.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   * @param entities - Entities matching system requirements
+   */
+  process(deltaTime: number, entities: Entity[]): void {
+    const playerController = this.engine.systems.find(
+      (s) => s.name === SystemName.PLAYER_CONTROLLER
+    ) as PlayerControllerSystem | undefined;
+    const player = playerController?.getPlayerEntity();
+    if (!player) return;
+    const playerPos = player?.getComponent<Position>(ComponentType.POSITION);
+    const config = GameConfig.AI;
+
+    entities.forEach((entity) => {
+      const health = entity.getComponent<Health>(ComponentType.HEALTH);
+      const ai = entity.getComponent<AI>(ComponentType.AI);
+      const position = entity.getComponent<Position>(ComponentType.POSITION);
+      const velocity = entity.getComponent<Velocity>(ComponentType.VELOCITY);
+
+      if (!ai || !position || !velocity) return;
+
+      if (health && health.isDead() && !health.isProjectile) {
+        velocity.vx = 0;
+        velocity.vy = 0;
+        return;
+      }
+
+      ai.wanderChangeTime += deltaTime;
+
+      if (playerPos) {
+        const dx = playerPos.x - position.x;
+        const dy = playerPos.y - position.y;
+        const distance = Math.sqrt(dx * dx + dy * dy);
+
+        const playerStealth = player?.getComponent<Stealth>(ComponentType.STEALTH);
+        const playerVisibility = playerStealth ? playerStealth.visibility : 1.0;
+
+        if (distance < ai.alertRadius) {
+          const detectionChance = (1 - distance / ai.alertRadius) * playerVisibility;
+          ai.updateAwareness(detectionChance * deltaTime * config.awarenessGainMultiplier);
+        } else {
+          ai.updateAwareness(-deltaTime * config.awarenessLossRate);
+        }
+
+        const playerEvolution = player?.getComponent<Evolution>(ComponentType.EVOLUTION);
+        const playerForm = playerEvolution ? playerEvolution.getDominantForm() : 'slime';
+        const sprite = entity.getComponent<Sprite>(ComponentType.SPRITE);
+        const entityType =
+          sprite?.color === '#ffaa00'
+            ? 'beast'
+            : sprite?.color === '#ff5555'
+              ? 'humanoid'
+              : 'other';
+
+        let isPassive = false;
+        let shouldFlee = false;
+
+        if (entityType === 'humanoid' && playerForm === 'human') {
+          if (ai.awareness < config.passiveAwarenessThreshold) isPassive = true;
+        } else if (entityType === 'beast' && playerForm === 'beast') {
+          const playerStats = player?.getComponent<Stats>(ComponentType.STATS);
+          const entityStats = entity.getComponent<Stats>(ComponentType.STATS);
+          if (playerStats && entityStats && playerStats.level > entityStats.level) {
+            shouldFlee = true;
+          }
+        }
+
+        if (shouldFlee && ai.awareness > config.fleeAwarenessThreshold) {
+          ai.setBehavior('flee');
+          ai.state = 'fleeing';
+          ai.setTarget(player.id);
+        } else if (isPassive) {
+          if (ai.behaviorType === 'chase' || ai.behaviorType === 'combat') {
+            ai.setBehavior('wander');
+            ai.state = 'idle';
+            ai.clearTarget();
+          }
+        } else if (ai.awareness > config.detectionAwarenessThreshold && distance < ai.chaseRadius) {
+          if (ai.behaviorType !== 'flee') {
+            const combat = entity.getComponent<Combat>(ComponentType.COMBAT);
+            if (combat && distance <= combat.attackRange) {
+              ai.setBehavior('combat');
+              ai.state = 'combat';
+            } else {
+              ai.setBehavior('chase');
+              ai.state = 'chasing';
+            }
+            ai.setTarget(player.id);
+          }
+        } else if (ai.awareness < 0.3) {
+          if (ai.behaviorType === 'chase' || ai.behaviorType === 'combat') {
+            ai.setBehavior('wander');
+            ai.state = 'idle';
+            ai.clearTarget();
+          }
+        } else if (ai.behaviorType === 'chase') {
+          const combat = entity.getComponent<Combat>(ComponentType.COMBAT);
+          if (combat && distance <= combat.attackRange) {
+            ai.setBehavior('combat');
+            ai.state = 'combat';
+          }
+        }
+      }
+
+      switch (ai.behaviorType) {
+        case 'wander':
+          this.wander(entity, ai, velocity, deltaTime);
+          break;
+        case 'chase':
+          this.chase(entity, ai, velocity, position, playerPos);
+          break;
+        case 'flee':
+          this.flee(entity, ai, velocity, position, playerPos);
+          break;
+        case 'combat':
+          this.combat(entity, ai, velocity, position, playerPos);
+          break;
+      }
+    });
+  }
+
+  /**
+   * Execute wandering behavior, moving in a random direction.
+   */
+  wander(_entity: Entity, ai: AI, velocity: Velocity, _deltaTime: number): void {
+    ai.state = 'moving';
+
+    if (ai.wanderChangeTime >= ai.wanderChangeInterval) {
+      ai.wanderDirection = Math.random() * Math.PI * 2;
+      ai.wanderChangeTime = 0;
+      ai.wanderChangeInterval = 1 + Math.random() * 2;
+    }
+
+    velocity.vx = Math.cos(ai.wanderDirection) * ai.wanderSpeed;
+    velocity.vy = Math.sin(ai.wanderDirection) * ai.wanderSpeed;
+  }
+
+  /**
+   * Execute chasing behavior, moving toward a target.
+   */
+  chase(
+    entity: Entity,
+    ai: AI,
+    velocity: Velocity,
+    position: Position,
+    targetPos: Position | undefined
+  ): void {
+    if (!targetPos) return;
+
+    const dx = targetPos.x - position.x;
+    const dy = targetPos.y - position.y;
+    const distance = Math.sqrt(dx * dx + dy * dy);
+
+    const combat = entity.getComponent<Combat>(ComponentType.COMBAT);
+    if (combat && distance <= combat.attackRange) {
+      ai.setBehavior('combat');
+      ai.state = 'combat';
+      return;
+    }
+
+    ai.state = 'chasing';
+    if (distance > 0.1) {
+      const speed = ai.wanderSpeed * 1.5;
+      velocity.vx = (dx / distance) * speed;
+      velocity.vy = (dy / distance) * speed;
+    } else {
+      velocity.vx = 0;
+      velocity.vy = 0;
+    }
+  }
+
+  /**
+   * Execute fleeing behavior, moving away from a target.
+   */
+  flee(
+    _entity: Entity,
+    ai: AI,
+    velocity: Velocity,
+    position: Position,
+    targetPos: Position | undefined
+  ): void {
+    if (!targetPos) return;
+
+    ai.state = 'fleeing';
+    const dx = position.x - targetPos.x;
+    const dy = position.y - targetPos.y;
+    const distance = Math.sqrt(dx * dx + dy * dy);
+
+    if (distance > 0.1) {
+      const speed = ai.wanderSpeed * 1.2;
+      velocity.vx = (dx / distance) * speed;
+      velocity.vy = (dy / distance) * speed;
+    }
+  }
+
+  /**
+   * Execute combat behavior, moving into range and setting attack intent.
+   */
+  combat(
+    entity: Entity,
+    ai: AI,
+    velocity: Velocity,
+    position: Position,
+    targetPos: Position | undefined
+  ): void {
+    if (!targetPos) return;
+
+    ai.state = 'attacking';
+    const dx = targetPos.x - position.x;
+    const dy = targetPos.y - position.y;
+    const distance = Math.sqrt(dx * dx + dy * dy);
+
+    const combat = entity.getComponent<Combat>(ComponentType.COMBAT);
+    if (combat && distance > combat.attackRange) {
+      const speed = ai.wanderSpeed;
+      velocity.vx = (dx / distance) * speed;
+      velocity.vy = (dy / distance) * speed;
+    } else {
+      velocity.vx *= 0.5;
+      velocity.vy *= 0.5;
+      position.rotation = Math.atan2(dy, dx);
+
+      const intent = entity.getComponent<Intent>(ComponentType.INTENT);
+      if (intent) {
+        intent.setIntent('attack', { targetX: targetPos.x, targetY: targetPos.y });
+      }
+    }
+  }
+}

src/systems/AbsorptionSystem.js

@@ -1,176 +0,0 @@
-import { System } from '../core/System.js';
-import { GameConfig } from '../GameConfig.js';
-import { Events } from '../core/EventBus.js';
-
-export class AbsorptionSystem extends System {
-  constructor() {
-    super('AbsorptionSystem');
-    this.requiredComponents = ['Position', 'Absorbable'];
-    this.priority = 25;
-    this.absorptionEffects = []; // Visual effects
-  }
-
-  process(deltaTime, _entities) {
-    const playerController = this.engine.systems.find(s => s.name === 'PlayerControllerSystem');
-    const player = playerController ? playerController.getPlayerEntity() : null;
-
-    if (!player) return;
-
-    const playerPos = player.getComponent('Position');
-    const playerEvolution = player.getComponent('Evolution');
-    const playerSkills = player.getComponent('Skills');
-    const playerStats = player.getComponent('Stats');
-    const skillProgress = player.getComponent('SkillProgress');
-
-    if (!playerPos || !playerEvolution) return;
-
-    // Get ALL entities (including inactive ones) for absorption check
-    const allEntities = this.engine.entities; // Get raw entities array, not filtered
-
-    const config = GameConfig.Absorption;
-
-    // Check for absorbable entities near player
-    allEntities.forEach(entity => {
-      if (entity === player) return;
-      // Allow inactive entities if they're dead and absorbable
-      if (!entity.active) {
-        const health = entity.getComponent('Health');
-        const absorbable = entity.getComponent('Absorbable');
-        // Only process inactive entities if they're dead and not yet absorbed
-        if (!health || !health.isDead() || !absorbable || absorbable.absorbed) {
-          return;
-        }
-      }
-      if (!entity.hasComponent('Absorbable')) return;
-      if (!entity.hasComponent('Health')) return;
-
-      const absorbable = entity.getComponent('Absorbable');
-      const health = entity.getComponent('Health');
-      const entityPos = entity.getComponent('Position');
-
-      if (!entityPos) return;
-
-      // Check if creature is dead and in absorption range
-      if (health.isDead() && !absorbable.absorbed) {
-        const dx = playerPos.x - entityPos.x;
-        const dy = playerPos.y - entityPos.y;
-        const distance = Math.sqrt(dx * dx + dy * dy);
-
-        if (distance <= config.range) {
-          this.absorbEntity(player, entity, absorbable, playerEvolution, playerSkills, playerStats, skillProgress);
-        }
-      }
-    });
-
-    // Update visual effects
-    this.updateEffects(deltaTime);
-  }
-
-  absorbEntity(player, entity, absorbable, evolution, skills, stats, skillProgress) {
-    if (absorbable.absorbed) return;
-
-    absorbable.absorbed = true;
-    const entityPos = entity.getComponent('Position');
-    const health = player.getComponent('Health');
-    const config = GameConfig.Absorption;
-
-    // Add evolution points
-    evolution.addEvolution(
-      absorbable.evolutionData.human,
-      absorbable.evolutionData.beast,
-      absorbable.evolutionData.slime
-    );
-
-    // Track skill progress (need to absorb multiple times to learn)
-    // Always track progress for ALL skills the enemy has, regardless of roll
-    if (skillProgress && absorbable.skillsGranted && absorbable.skillsGranted.length > 0) {
-      absorbable.skillsGranted.forEach(skill => {
-        // Always add progress when absorbing an enemy with this skill
-        const currentProgress = skillProgress.addSkillProgress(skill.id);
-        const required = skillProgress.requiredAbsorptions;
-
-        // If we've absorbed enough, learn the skill
-        if (currentProgress >= required && !skills.hasSkill(skill.id)) {
-          skills.addSkill(skill.id, false);
-          this.engine.emit(Events.SKILL_LEARNED, { id: skill.id });
-          console.log(`Learned skill: ${skill.id}!`);
-        }
-      });
-    }
-
-    // Heal from absorption (slime recovers by consuming)
-    if (health) {
-      const healPercent = config.healPercentMin + Math.random() * (config.healPercentMax - config.healPercentMin);
-      const healAmount = health.maxHp * healPercent;
-      health.heal(healAmount);
-    }
-
-    // Check for mutation
-    if (absorbable.shouldMutate() && stats) {
-      this.applyMutation(stats);
-      evolution.checkMutations(stats, this.engine);
-    }
-
-    // Visual effect
-    if (entityPos) {
-      this.addAbsorptionEffect(entityPos.x, entityPos.y);
-    }
-
-    // Mark as absorbed - DeathSystem will handle removal after absorption window
-    // Don't remove immediately, let DeathSystem handle it
-  }
-
-  applyMutation(stats) {
-    // Random stat mutation
-    const mutations = [
-      { stat: 'strength', amount: 5 },
-      { stat: 'agility', amount: 5 },
-      { stat: 'intelligence', amount: 5 },
-      { stat: 'constitution', amount: 5 },
-      { stat: 'perception', amount: 5 },
-    ];
-
-    const mutation = mutations[Math.floor(Math.random() * mutations.length)];
-    stats[mutation.stat] += mutation.amount;
-
-    // Could also add negative mutations
-    if (Math.random() < 0.3) {
-      const negativeStat = mutations[Math.floor(Math.random() * mutations.length)];
-      stats[negativeStat.stat] = Math.max(1, stats[negativeStat.stat] - 2);
-    }
-  }
-
-  addAbsorptionEffect(x, y) {
-    for (let i = 0; i < 20; i++) {
-      this.absorptionEffects.push({
-        x,
-        y,
-        vx: (Math.random() - 0.5) * 200,
-        vy: (Math.random() - 0.5) * 200,
-        lifetime: 0.5 + Math.random() * 0.5,
-        size: 3 + Math.random() * 5,
-        color: `hsl(${120 + Math.random() * 60}, 100%, 50%)`
-      });
-    }
-  }
-
-  updateEffects(deltaTime) {
-    for (let i = this.absorptionEffects.length - 1; i >= 0; i--) {
-      const effect = this.absorptionEffects[i];
-      effect.x += effect.vx * deltaTime;
-      effect.y += effect.vy * deltaTime;
-      effect.lifetime -= deltaTime;
-      effect.vx *= 0.95;
-      effect.vy *= 0.95;
-
-      if (effect.lifetime <= 0) {
-        this.absorptionEffects.splice(i, 1);
-      }
-    }
-  }
-
-  getEffects() {
-    return this.absorptionEffects;
-  }
-}
-

src/systems/AbsorptionSystem.ts

@@ -0,0 +1,172 @@
+import { System } from '../core/System.ts';
+import { GameConfig } from '../GameConfig.ts';
+import { Events } from '../core/EventBus.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Position } from '../components/Position.ts';
+import type { Evolution } from '../components/Evolution.ts';
+import type { Skills } from '../components/Skills.ts';
+import type { Stats } from '../components/Stats.ts';
+import type { SkillProgress } from '../components/SkillProgress.ts';
+import type { Absorbable } from '../components/Absorbable.ts';
+import type { Health } from '../components/Health.ts';
+import type { PlayerControllerSystem } from './PlayerControllerSystem.ts';
+import type { VFXSystem } from './VFXSystem.ts';
+
+/**
+ * System responsible for identifying dead absorbable entities near the player and processing absorption.
+ */
+export class AbsorptionSystem extends System {
+  constructor() {
+    super(SystemName.ABSORPTION);
+    this.requiredComponents = [ComponentType.POSITION, ComponentType.ABSORBABLE];
+    this.priority = 25;
+  }
+
+  /**
+   * Check for absorbable entities within range of the player and initiate absorption if applicable.
+   * @param _deltaTime - Time elapsed since last frame
+   * @param _entities - Matching entities (not used, uses raw engine entities)
+   */
+  process(_deltaTime: number, _entities: Entity[]): void {
+    const playerController = this.engine.systems.find(
+      (s) => s.name === SystemName.PLAYER_CONTROLLER
+    ) as PlayerControllerSystem | undefined;
+    const player = playerController ? playerController.getPlayerEntity() : null;
+
+    if (!player) return;
+
+    const playerPos = player.getComponent<Position>(ComponentType.POSITION);
+    const playerEvolution = player.getComponent<Evolution>(ComponentType.EVOLUTION);
+    const playerSkills = player.getComponent<Skills>(ComponentType.SKILLS);
+    const playerStats = player.getComponent<Stats>(ComponentType.STATS);
+    const skillProgress = player.getComponent<SkillProgress>(ComponentType.SKILL_PROGRESS);
+
+    if (!playerPos || !playerEvolution) return;
+
+    const allEntities = this.engine.entities;
+    const config = GameConfig.Absorption;
+
+    allEntities.forEach((entity) => {
+      if (entity === player) return;
+      if (!entity.active) {
+        const health = entity.getComponent<Health>(ComponentType.HEALTH);
+        const absorbable = entity.getComponent<Absorbable>(ComponentType.ABSORBABLE);
+        if (!health || !health.isDead() || !absorbable || absorbable.absorbed) {
+          return;
+        }
+      }
+      if (!entity.hasComponent(ComponentType.ABSORBABLE)) return;
+      if (!entity.hasComponent(ComponentType.HEALTH)) return;
+
+      const absorbable = entity.getComponent<Absorbable>(ComponentType.ABSORBABLE);
+      const health = entity.getComponent<Health>(ComponentType.HEALTH);
+      const entityPos = entity.getComponent<Position>(ComponentType.POSITION);
+
+      if (!entityPos) return;
+
+      if (health && health.isDead() && absorbable && !absorbable.absorbed) {
+        const dx = playerPos.x - entityPos.x;
+        const dy = playerPos.y - entityPos.y;
+        const distance = Math.sqrt(dx * dx + dy * dy);
+
+        if (distance <= config.range) {
+          this.absorbEntity(
+            player,
+            entity,
+            absorbable,
+            playerEvolution,
+            playerSkills,
+            playerStats,
+            skillProgress
+          );
+        }
+      }
+    });
+  }
+
+  /**
+   * Process the absorption of an entity by the player.
+   */
+  absorbEntity(
+    player: Entity,
+    entity: Entity,
+    absorbable: Absorbable,
+    evolution: Evolution,
+    skills: Skills | undefined,
+    stats: Stats | undefined,
+    skillProgress: SkillProgress | undefined
+  ): void {
+    if (absorbable.absorbed) return;
+
+    absorbable.absorbed = true;
+    const entityPos = entity.getComponent<Position>(ComponentType.POSITION);
+    const health = player.getComponent<Health>(ComponentType.HEALTH);
+    const config = GameConfig.Absorption;
+
+    evolution.addEvolution(
+      absorbable.evolutionData.human,
+      absorbable.evolutionData.beast,
+      absorbable.evolutionData.slime
+    );
+
+    if (skillProgress && absorbable.skillsGranted && absorbable.skillsGranted.length > 0) {
+      absorbable.skillsGranted.forEach((skill) => {
+        const currentProgress = skillProgress.addSkillProgress(skill.id);
+        const required = skillProgress.requiredAbsorptions;
+
+        if (currentProgress >= required && skills && !skills.hasSkill(skill.id)) {
+          skills.addSkill(skill.id, false);
+          this.engine.emit(Events.SKILL_LEARNED, { id: skill.id });
+          console.log(`Learned skill: ${skill.id}!`);
+        }
+      });
+    }
+
+    if (health) {
+      const healPercent =
+        config.healPercentMin + Math.random() * (config.healPercentMax - config.healPercentMin);
+      const healAmount = health.maxHp * healPercent;
+      health.heal(healAmount);
+    }
+
+    if (absorbable.shouldMutate() && stats) {
+      this.applyMutation(stats);
+      evolution.checkMutations(stats, this.engine);
+    }
+
+    if (entityPos) {
+      const vfxSystem = this.engine.systems.find((s) => s.name === SystemName.VFX) as
+        | VFXSystem
+        | undefined;
+      if (vfxSystem) {
+        vfxSystem.createAbsorption(entityPos.x, entityPos.y);
+      }
+    }
+
+    this.engine.emit(Events.ABSORPTION, { entity });
+  }
+
+  /**
+   * Apply a random stat mutation (positive or negative) to an entity's stats.
+   * @param stats - The stats component to mutate
+   */
+  applyMutation(stats: Stats): void {
+    type StatName = 'strength' | 'agility' | 'intelligence' | 'constitution' | 'perception';
+    const mutations: Array<{ stat: StatName; amount: number }> = [
+      { stat: 'strength', amount: 5 },
+      { stat: 'agility', amount: 5 },
+      { stat: 'intelligence', amount: 5 },
+      { stat: 'constitution', amount: 5 },
+      { stat: 'perception', amount: 5 },
+    ];
+
+    const mutation = mutations[Math.floor(Math.random() * mutations.length)];
+    stats[mutation.stat] += mutation.amount;
+
+    if (Math.random() < 0.3) {
+      const negativeStat = mutations[Math.floor(Math.random() * mutations.length)];
+      stats[negativeStat.stat] = Math.max(1, stats[negativeStat.stat] - 2);
+    }
+  }
+}

src/systems/CameraSystem.ts

@@ -0,0 +1,50 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Camera } from '../components/Camera.ts';
+import type { Position } from '../components/Position.ts';
+import type { PlayerControllerSystem } from './PlayerControllerSystem.ts';
+
+/**
+ * System responsible for camera movement and following the player.
+ */
+export class CameraSystem extends System {
+  constructor() {
+    super(SystemName.CAMERA);
+    this.requiredComponents = [ComponentType.CAMERA];
+    this.priority = 0;
+  }
+
+  /**
+   * Update camera position to smoothly follow the player.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   * @param entities - Filtered entities with Camera component
+   */
+  process(deltaTime: number, entities: Entity[]): void {
+    const playerController = this.engine.systems.find(
+      (s) => s.name === SystemName.PLAYER_CONTROLLER
+    ) as PlayerControllerSystem | undefined;
+    const player = playerController ? playerController.getPlayerEntity() : null;
+
+    if (!player) return;
+
+    const playerPos = player.getComponent<Position>(ComponentType.POSITION);
+    if (!playerPos) return;
+
+    entities.forEach((entity) => {
+      const camera = entity.getComponent<Camera>(ComponentType.CAMERA);
+      if (!camera) return;
+
+      camera.targetX = playerPos.x;
+      camera.targetY = playerPos.y;
+
+      const dx = camera.targetX - camera.x;
+      const dy = camera.targetY - camera.y;
+
+      camera.x += dx * camera.smoothness;
+      camera.y += dy * camera.smoothness;
+
+      camera.clampToBounds();
+    });
+  }
+}

src/systems/CombatSystem.js

@@ -1,190 +0,0 @@
-import { System } from '../core/System.js';
-import { GameConfig } from '../GameConfig.js';
-import { Events } from '../core/EventBus.js';
-
-export class CombatSystem extends System {
-  constructor() {
-    super('CombatSystem');
-    this.requiredComponents = ['Position', 'Combat', 'Health'];
-    this.priority = 20;
-  }
-
-  process(deltaTime, entities) {
-    // Update combat cooldowns
-    entities.forEach(entity => {
-      const combat = entity.getComponent('Combat');
-      if (combat) {
-        combat.update(deltaTime);
-      }
-    });
-
-    // Handle player attacks
-    const playerController = this.engine.systems.find(s => s.name === 'PlayerControllerSystem');
-    const player = playerController ? playerController.getPlayerEntity() : null;
-
-    if (player && player.hasComponent('Combat')) {
-      this.handlePlayerCombat(player, deltaTime);
-    }
-
-    // Handle creature attacks
-    const creatures = entities.filter(e =>
-      e.hasComponent('AI') &&
-            e.hasComponent('Combat') &&
-            e !== player
-    );
-
-    creatures.forEach(creature => {
-      this.handleCreatureCombat(creature, player, deltaTime);
-    });
-
-    // Check for collisions and apply damage
-    this.processCombatCollisions(entities, deltaTime);
-  }
-
-  handlePlayerCombat(player, _deltaTime) {
-    const inputSystem = this.engine.systems.find(s => s.name === 'InputSystem');
-    const combat = player.getComponent('Combat');
-    const position = player.getComponent('Position');
-
-    if (!inputSystem || !combat || !position) return;
-
-    const currentTime = Date.now() / 1000;
-
-    // Attack on mouse click or space (use justPressed to prevent spam)
-    const mouseClick = inputSystem.isMouseButtonJustPressed(0);
-    const spacePress = inputSystem.isKeyJustPressed(' ') || inputSystem.isKeyJustPressed('space');
-
-    if ((mouseClick || spacePress) && combat.canAttack(currentTime)) {
-      // Calculate attack direction from player to mouse
-      const mouse = inputSystem.getMousePosition();
-      const dx = mouse.x - position.x;
-      const dy = mouse.y - position.y;
-      const attackAngle = Math.atan2(dy, dx);
-
-      // Update player rotation to face attack direction
-      position.rotation = attackAngle;
-
-      combat.attack(currentTime, attackAngle);
-
-      // Check for nearby enemies to damage
-      this.performAttack(player, combat, position);
-    }
-  }
-
-  handleCreatureCombat(creature, player, _deltaTime) {
-    const ai = creature.getComponent('AI');
-    const combat = creature.getComponent('Combat');
-    const position = creature.getComponent('Position');
-    const playerPos = player?.getComponent('Position');
-
-    if (!ai || !combat || !position) return;
-
-    // Attack player if in range and aware (check both combat state and chase behavior)
-    if (playerPos && ai.awareness > 0.5 && (ai.state === 'combat' || ai.behaviorType === 'combat' || (ai.behaviorType === 'chase' && ai.awareness > 0.7))) {
-      const dx = playerPos.x - position.x;
-      const dy = playerPos.y - position.y;
-      const distance = Math.sqrt(dx * dx + dy * dy);
-
-      if (distance <= combat.attackRange) {
-        const currentTime = Date.now() / 1000;
-        if (combat.canAttack(currentTime)) {
-          const angle = Math.atan2(dy, dx);
-          combat.attack(currentTime, angle);
-          this.performAttack(creature, combat, position);
-        }
-      }
-    }
-  }
-
-  performAttack(attacker, combat, attackerPos) {
-    const entities = this.engine.getEntities();
-    const stats = attacker.getComponent('Stats');
-    const _baseDamage = stats ?
-      (combat.attackDamage + stats.strength * 0.5) :
-      combat.attackDamage;
-
-    entities.forEach(target => {
-      if (target === attacker) return;
-      if (!target.hasComponent('Health')) return;
-
-      const targetPos = target.getComponent('Position');
-      if (!targetPos) return;
-
-      // Check if in attack range and angle
-      const dx = targetPos.x - attackerPos.x;
-      const dy = targetPos.y - attackerPos.y;
-      const distance = Math.sqrt(dx * dx + dy * dy);
-
-      if (distance <= combat.attackRange) {
-        const angle = Math.atan2(dy, dx);
-        const angleDiff = Math.abs(angle - combat.attackDirection);
-        const normalizedDiff = Math.abs(((angleDiff % (Math.PI * 2)) + Math.PI * 2) % (Math.PI * 2));
-        const minDiff = Math.min(normalizedDiff, Math.PI * 2 - normalizedDiff);
-
-        // Attack arc
-        const attackArc = GameConfig.Combat.defaultAttackArc;
-        if (minDiff < attackArc) {
-          const health = target.getComponent('Health');
-          const config = GameConfig.Combat;
-          const stats = attacker.getComponent('Stats');
-          const baseDamage = stats ? (combat.attackDamage + stats.strength * 0.5) : combat.attackDamage;
-
-          // Defense bonus from Hardened Shell
-          let finalDamage = baseDamage;
-          const targetEvolution = target.getComponent('Evolution');
-
-          if (targetEvolution && targetEvolution.mutationEffects.hardenedShell) {
-            finalDamage *= config.hardenedShellReduction;
-          }
-
-          const actualDamage = health.takeDamage(finalDamage);
-
-          // Emit event for UI/VFX
-          this.engine.emit(Events.DAMAGE_DEALT, {
-            x: targetPos.x,
-            y: targetPos.y,
-            value: actualDamage,
-            color: '#ffffff'
-          });
-
-          // Damage reflection from Electric Skin
-          if (targetEvolution && targetEvolution.mutationEffects.electricSkin) {
-            const attackerHealth = attacker.getComponent('Health');
-            if (attackerHealth) {
-              const reflectedDamage = actualDamage * config.damageReflectionPercent;
-              attackerHealth.takeDamage(reflectedDamage);
-
-              this.engine.emit(Events.DAMAGE_DEALT, {
-                x: attackerPos.x,
-                y: attackerPos.y,
-                value: reflectedDamage,
-                color: '#00ffff'
-              });
-            }
-          }
-
-          // If target is dead, emit event
-          if (health.isDead()) {
-            this.engine.emit(Events.ENTITY_DIED, { entity: target });
-            target.active = false;
-          }
-
-          // Apply knockback
-          const velocity = target.getComponent('Velocity');
-          if (velocity) {
-            const knockbackPower = config.knockbackPower;
-            const kx = Math.cos(angle) * knockbackPower;
-            const ky = Math.sin(angle) * knockbackPower;
-            velocity.vx += kx;
-            velocity.vy += ky;
-          }
-        }
-      }
-    });
-  }
-
-  processCombatCollisions(_entities, _deltaTime) {
-    // This can be expanded for projectile collisions, area effects, etc.
-  }
-}
-

src/systems/CombatSystem.ts

@@ -0,0 +1,182 @@
+import { System } from '../core/System.ts';
+import { GameConfig } from '../GameConfig.ts';
+import { Events } from '../core/EventBus.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Combat } from '../components/Combat.ts';
+import type { Intent } from '../components/Intent.ts';
+import type { Position } from '../components/Position.ts';
+import type { Health } from '../components/Health.ts';
+import type { Sprite } from '../components/Sprite.ts';
+import type { Stats } from '../components/Stats.ts';
+import type { Evolution } from '../components/Evolution.ts';
+import type { Velocity } from '../components/Velocity.ts';
+
+/**
+ * System responsible for managing combat interactions, attack intent processing, and damage application.
+ */
+export class CombatSystem extends System {
+  constructor() {
+    super(SystemName.COMBAT);
+    this.requiredComponents = [ComponentType.POSITION, ComponentType.COMBAT, ComponentType.HEALTH];
+    this.priority = 20;
+  }
+
+  /**
+   * Process combat updates, timers, and entity attack intents.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   * @param entities - Entities matching system requirements
+   */
+  process(deltaTime: number, entities: Entity[]): void {
+    const currentTime = Date.now() / 1000;
+
+    entities.forEach((entity) => {
+      const combat = entity.getComponent<Combat>(ComponentType.COMBAT);
+      const intent = entity.getComponent<Intent>(ComponentType.INTENT);
+      const position = entity.getComponent<Position>(ComponentType.POSITION);
+
+      if (combat) {
+        combat.update(deltaTime);
+      }
+
+      if (intent && intent.action === 'attack' && combat && position) {
+        if (combat.canAttack(currentTime)) {
+          const { targetX, targetY } = intent.data;
+          const dx = targetX - position.x;
+          const dy = targetY - position.y;
+          const angle = Math.atan2(dy, dx);
+
+          this.performAttack(entity, angle);
+        }
+        intent.clear();
+      }
+    });
+
+    this.processCombatCollisions(entities, deltaTime);
+  }
+
+  /**
+   * Initiate an attack from an entity at a specific angle.
+   * @param attacker - The entity performing the attack
+   * @param angle - The attack angle in radians
+   */
+  performAttack(attacker: Entity, angle: number): void {
+    const attackerPos = attacker.getComponent<Position>(ComponentType.POSITION);
+    const combat = attacker.getComponent<Combat>(ComponentType.COMBAT);
+    if (!attackerPos || !combat) return;
+
+    const currentTime = Date.now() / 1000;
+    combat.attack(currentTime, angle);
+
+    this.engine.emit(Events.ATTACK_PERFORMED, { entity: attacker, angle });
+
+    const entities = this.engine.getEntities();
+    entities.forEach((target) => {
+      if (target === attacker) return;
+      if (!target.hasComponent(ComponentType.HEALTH)) return;
+
+      const targetPos = target.getComponent<Position>(ComponentType.POSITION);
+      if (!targetPos) return;
+
+      const dx = targetPos.x - attackerPos.x;
+      const dy = targetPos.y - attackerPos.y;
+      const distance = Math.sqrt(dx * dx + dy * dy);
+
+      const targetSprite = target.getComponent<Sprite>(ComponentType.SPRITE);
+      const targetRadius = targetSprite ? Math.max(targetSprite.width, targetSprite.height) / 2 : 0;
+
+      if (distance <= combat.attackRange + targetRadius) {
+        const targetAngle = Math.atan2(dy, dx);
+        const angleDiff = Math.abs(targetAngle - angle);
+        const normalizedDiff = Math.abs(
+          ((angleDiff % (Math.PI * 2)) + Math.PI * 2) % (Math.PI * 2)
+        );
+        const minDiff = Math.min(normalizedDiff, Math.PI * 2 - normalizedDiff);
+
+        const attackArc = GameConfig.Combat.defaultAttackArc || Math.PI / 3;
+
+        if (minDiff < attackArc) {
+          this.applyDamage(attacker, target);
+
+          const vfxSystem = this.engine.systems.find((s) => s.name === SystemName.VFX) as
+            | VFXSystem
+            | undefined;
+          if (vfxSystem) {
+            vfxSystem.createImpact(targetPos.x, targetPos.y, '#ffffff', targetAngle);
+          }
+        }
+      }
+    });
+  }
+
+  /**
+   * Apply damage and effects from one entity to another.
+   * @param attacker - The attacking entity
+   * @param target - The target entity being damaged
+   */
+  applyDamage(attacker: Entity, target: Entity): void {
+    const health = target.getComponent<Health>(ComponentType.HEALTH);
+    const combat = attacker.getComponent<Combat>(ComponentType.COMBAT);
+    const stats = attacker.getComponent<Stats>(ComponentType.STATS);
+    const targetPos = target.getComponent<Position>(ComponentType.POSITION);
+    const attackerPos = attacker.getComponent<Position>(ComponentType.POSITION);
+
+    if (!health || !combat || !targetPos || !attackerPos) return;
+
+    const config = GameConfig.Combat;
+    const baseDamage = stats ? combat.attackDamage + stats.strength * 0.5 : combat.attackDamage;
+
+    let finalDamage = baseDamage;
+    const targetEvolution = target.getComponent<Evolution>(ComponentType.EVOLUTION);
+
+    if (targetEvolution && targetEvolution.mutationEffects.hardenedShell) {
+      finalDamage *= config.hardenedShellReduction;
+    }
+
+    const actualDamage = health.takeDamage(finalDamage);
+
+    this.engine.emit(Events.DAMAGE_DEALT, {
+      x: targetPos.x,
+      y: targetPos.y,
+      value: actualDamage,
+      color: '#ffffff',
+    });
+
+    if (targetEvolution && targetEvolution.mutationEffects.electricSkin) {
+      const attackerHealth = attacker.getComponent<Health>(ComponentType.HEALTH);
+      if (attackerHealth) {
+        const reflectedDamage = actualDamage * config.damageReflectionPercent;
+        attackerHealth.takeDamage(reflectedDamage);
+
+        this.engine.emit(Events.DAMAGE_DEALT, {
+          x: attackerPos.x,
+          y: attackerPos.y,
+          value: reflectedDamage,
+          color: '#00ffff',
+        });
+      }
+    }
+
+    const velocity = target.getComponent<Velocity>(ComponentType.VELOCITY);
+    if (velocity) {
+      const dx = targetPos.x - attackerPos.x;
+      const dy = targetPos.y - attackerPos.y;
+      const dist = Math.sqrt(dx * dx + dy * dy);
+      const kx = (dx / dist) * config.knockbackPower;
+      const ky = (dy / dist) * config.knockbackPower;
+      velocity.vx += kx;
+      velocity.vy += ky;
+    }
+
+    if (health.isDead()) {
+      this.engine.emit(Events.ENTITY_DIED, { entity: target });
+    }
+  }
+
+  /**
+   * Process collision-based combat events. Placeholder for future expansion.
+   * @param _entities - The entities to check
+   * @param _deltaTime - Time elapsed since last frame
+   */
+  processCombatCollisions(_entities: Entity[], _deltaTime: number): void {}
+}

src/systems/DeathSystem.js

@@ -1,56 +0,0 @@
-import { System } from '../core/System.js';
-
-/**
- * System to handle entity death - removes dead entities immediately
- */
-export class DeathSystem extends System {
-  constructor() {
-    super('DeathSystem');
-    this.requiredComponents = ['Health'];
-    this.priority = 50; // Run after absorption (absorption is priority 25)
-  }
-
-  update(deltaTime, _entities) {
-    // Override to check ALL entities, not just active ones
-    // Get all entities including inactive ones to check dead entities
-    const allEntities = this.engine.entities;
-    this.process(deltaTime, allEntities);
-  }
-
-  process(deltaTime, allEntities) {
-    allEntities.forEach(entity => {
-      const health = entity.getComponent('Health');
-      if (!health) return;
-
-      // Check if entity is dead
-      if (health.isDead()) {
-        // Don't remove player
-        const evolution = entity.getComponent('Evolution');
-        if (evolution) return; // Player has Evolution component
-
-        // Mark as inactive immediately so it stops being processed by other systems
-        if (entity.active) {
-          entity.active = false;
-          entity.deathTime = Date.now(); // Set death time when first marked dead
-        }
-
-        // Check if it's absorbable - if so, give a short window for absorption
-        const absorbable = entity.getComponent('Absorbable');
-        if (absorbable && !absorbable.absorbed) {
-          // Give 3 seconds for player to absorb, then remove
-          const timeSinceDeath = (Date.now() - entity.deathTime) / 1000;
-          if (timeSinceDeath > 3.0) {
-            this.engine.removeEntity(entity);
-          }
-        } else {
-          // Not absorbable or already absorbed - remove after short delay
-          const timeSinceDeath = (Date.now() - entity.deathTime) / 1000;
-          if (timeSinceDeath > 0.5) {
-            this.engine.removeEntity(entity);
-          }
-        }
-      }
-    });
-  }
-}
-

src/systems/DeathSystem.ts

@@ -0,0 +1,75 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Health } from '../components/Health.ts';
+import type { Evolution } from '../components/Evolution.ts';
+import type { Absorbable } from '../components/Absorbable.ts';
+import type { MenuSystem } from './MenuSystem.ts';
+
+/**
+ * System responsible for managing entity death, game over states, and cleanup of dead entities.
+ */
+export class DeathSystem extends System {
+  constructor() {
+    super(SystemName.DEATH);
+    this.requiredComponents = [ComponentType.HEALTH];
+    this.priority = 50;
+  }
+
+  /**
+   * Override update to process all entities (including inactive/dead ones).
+   * @param deltaTime - Time elapsed since last frame
+   * @param _entities - Filtered active entities (not used, uses raw engine entities)
+   */
+  update(deltaTime: number, _entities: Entity[]): void {
+    const allEntities = this.engine.entities;
+    this.process(deltaTime, allEntities);
+  }
+
+  /**
+   * Process death logic for all entities.
+   * @param _deltaTime - Time elapsed since last frame
+   * @param allEntities - All entities in the engine
+   */
+  process(_deltaTime: number, allEntities: Entity[]): void {
+    allEntities.forEach((entity) => {
+      const health = entity.getComponent<Health>(ComponentType.HEALTH);
+      if (!health) return;
+
+      if (health.isDead()) {
+        const evolution = entity.getComponent<Evolution>(ComponentType.EVOLUTION);
+        if (evolution) {
+          const menuSystem = this.engine.systems.find((s) => s.name === SystemName.MENU) as
+            | MenuSystem
+            | undefined;
+          if (menuSystem) {
+            menuSystem.showGameOver();
+          }
+          return;
+        }
+
+        if (entity.active || !entity.deathTime) {
+          if (entity.active) {
+            entity.active = false;
+          }
+          if (!entity.deathTime) {
+            entity.deathTime = Date.now();
+          }
+        }
+
+        const absorbable = entity.getComponent<Absorbable>(ComponentType.ABSORBABLE);
+        if (absorbable && !absorbable.absorbed) {
+          const timeSinceDeath = (Date.now() - (entity.deathTime || 0)) / 1000;
+          if (timeSinceDeath > 3.0) {
+            this.engine.removeEntity(entity);
+          }
+        } else {
+          const timeSinceDeath = (Date.now() - (entity.deathTime || 0)) / 1000;
+          if (timeSinceDeath > 0.5) {
+            this.engine.removeEntity(entity);
+          }
+        }
+      }
+    });
+  }
+}

src/systems/HealthRegenerationSystem.js

@@ -1,27 +0,0 @@
-import { System } from '../core/System.js';
-
-/**
- * System to handle health regeneration
- */
-export class HealthRegenerationSystem extends System {
-  constructor() {
-    super('HealthRegenerationSystem');
-    this.requiredComponents = ['Health'];
-    this.priority = 35;
-  }
-
-  process(deltaTime, entities) {
-    entities.forEach(entity => {
-      const health = entity.getComponent('Health');
-      if (!health || health.regeneration <= 0) return;
-
-      // Regenerate health over time
-      // Only regenerate if not recently damaged (5 seconds)
-      const timeSinceDamage = (Date.now() - health.lastDamageTime) / 1000;
-      if (timeSinceDamage > 5) {
-        health.heal(health.regeneration * deltaTime);
-      }
-    });
-  }
-}
-

src/systems/HealthRegenerationSystem.ts

@@ -0,0 +1,32 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Health } from '../components/Health.ts';
+
+/**
+ * System responsible for managing health regeneration for entities over time.
+ */
+export class HealthRegenerationSystem extends System {
+  constructor() {
+    super(SystemName.HEALTH_REGEN);
+    this.requiredComponents = [ComponentType.HEALTH];
+    this.priority = 35;
+  }
+
+  /**
+   * Process health regeneration for entities that haven't been damaged recently.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   * @param entities - Entities matching system requirements
+   */
+  process(deltaTime: number, entities: Entity[]): void {
+    entities.forEach((entity) => {
+      const health = entity.getComponent<Health>(ComponentType.HEALTH);
+      if (!health || health.regeneration <= 0) return;
+
+      const timeSinceDamage = (Date.now() - health.lastDamageTime) / 1000;
+      if (timeSinceDamage > 5) {
+        health.heal(health.regeneration * deltaTime);
+      }
+    });
+  }
+}

src/systems/InputSystem.js

@@ -1,153 +0,0 @@
-import { System } from '../core/System.js';
-
-export class InputSystem extends System {
-  constructor() {
-    super('InputSystem');
-    this.requiredComponents = []; // No required components - handles input globally
-    this.priority = 0; // Run first
-
-    this.keys = {};
-    this.keysPrevious = {}; // Track previous frame key states
-    this.mouse = {
-      x: 0,
-      y: 0,
-      buttons: {},
-      buttonsPrevious: {}
-    };
-  }
-
-  init(engine) {
-    super.init(engine);
-    this.setupEventListeners();
-  }
-
-  setupEventListeners() {
-    window.addEventListener('keydown', (e) => {
-      const key = e.key.toLowerCase();
-      const code = e.code.toLowerCase();
-
-      // Store by key name
-      this.keys[key] = true;
-      this.keys[code] = true;
-
-      // Handle special keys
-      if (key === ' ') {
-        this.keys['space'] = true;
-      }
-      if (code === 'space') {
-        this.keys['space'] = true;
-      }
-
-      // Arrow keys
-      if (code === 'arrowup') this.keys['arrowup'] = true;
-      if (code === 'arrowdown') this.keys['arrowdown'] = true;
-      if (code === 'arrowleft') this.keys['arrowleft'] = true;
-      if (code === 'arrowright') this.keys['arrowright'] = true;
-
-      // Prevent default for game keys
-      if ([' ', 'w', 'a', 's', 'd', '1', '2', '3', '4', '5', '6', '7', '8', '9'].includes(key)) {
-        e.preventDefault();
-      }
-    });
-
-    window.addEventListener('keyup', (e) => {
-      const key = e.key.toLowerCase();
-      const code = e.code.toLowerCase();
-
-      this.keys[key] = false;
-      this.keys[code] = false;
-
-      // Handle special keys
-      if (key === ' ') {
-        this.keys['space'] = false;
-      }
-      if (code === 'space') {
-        this.keys['space'] = false;
-      }
-
-      // Arrow keys
-      if (code === 'arrowup') this.keys['arrowup'] = false;
-      if (code === 'arrowdown') this.keys['arrowdown'] = false;
-      if (code === 'arrowleft') this.keys['arrowleft'] = false;
-      if (code === 'arrowright') this.keys['arrowright'] = false;
-    });
-
-    window.addEventListener('mousemove', (e) => {
-      if (this.engine && this.engine.canvas) {
-        const canvas = this.engine.canvas;
-        const rect = canvas.getBoundingClientRect();
-        this.mouse.x = e.clientX - rect.left;
-        this.mouse.y = e.clientY - rect.top;
-      }
-    });
-
-    window.addEventListener('mousedown', (e) => {
-      this.mouse.buttons[e.button] = true;
-    });
-
-    window.addEventListener('mouseup', (e) => {
-      this.mouse.buttons[e.button] = false;
-    });
-  }
-
-  process(_deltaTime, _entities) {
-    // Don't update previous states here - that happens at end of frame
-    // This allows other systems to check isKeyJustPressed during the frame
-  }
-
-  /**
-     * Update previous states - called at end of frame
-     */
-  updatePreviousStates() {
-    // Deep copy current states to previous for next frame
-    this.keysPrevious = {};
-    for (const key in this.keys) {
-      this.keysPrevious[key] = this.keys[key];
-    }
-    this.mouse.buttonsPrevious = {};
-    for (const button in this.mouse.buttons) {
-      this.mouse.buttonsPrevious[button] = this.mouse.buttons[button];
-    }
-  }
-
-  /**
-     * Check if a key is currently pressed
-     */
-  isKeyPressed(key) {
-    return this.keys[key.toLowerCase()] === true;
-  }
-
-  /**
-     * Check if a key was just pressed (not held from previous frame)
-     */
-  isKeyJustPressed(key) {
-    const keyLower = key.toLowerCase();
-    const isPressed = this.keys[keyLower] === true;
-    const wasPressed = this.keysPrevious[keyLower] === true;
-    return isPressed && !wasPressed;
-  }
-
-  /**
-     * Get mouse position
-     */
-  getMousePosition() {
-    return { x: this.mouse.x, y: this.mouse.y };
-  }
-
-  /**
-     * Check if mouse button is pressed
-     */
-  isMouseButtonPressed(button = 0) {
-    return this.mouse.buttons[button] === true;
-  }
-
-  /**
-     * Check if mouse button was just pressed
-     */
-  isMouseButtonJustPressed(button = 0) {
-    const isPressed = this.mouse.buttons[button] === true;
-    const wasPressed = this.mouse.buttonsPrevious[button] === true;
-    return isPressed && !wasPressed;
-  }
-}
-

src/systems/InputSystem.ts

@@ -0,0 +1,200 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Engine } from '../core/Engine.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Camera } from '../components/Camera.ts';
+
+interface MouseState {
+  x: number;
+  y: number;
+  buttons: Record<number, boolean>;
+  buttonsPrevious: Record<number, boolean>;
+}
+
+/**
+ * System responsible for capturing and managing keyboard and mouse input.
+ */
+export class InputSystem extends System {
+  keys: Record<string, boolean>;
+  keysPrevious: Record<string, boolean>;
+  mouse: MouseState;
+
+  constructor() {
+    super(SystemName.INPUT);
+    this.requiredComponents = [];
+    this.priority = 0;
+
+    this.keys = {};
+    this.keysPrevious = {};
+    this.mouse = {
+      x: 0,
+      y: 0,
+      buttons: {},
+      buttonsPrevious: {},
+    };
+  }
+
+  /**
+   * Initialize the system and set up event listeners.
+   * @param engine - The game engine instance
+   */
+  init(engine: Engine): void {
+    super.init(engine);
+    this.setupEventListeners();
+  }
+
+  /**
+   * Set up browser event listeners for keyboard and mouse.
+   */
+  setupEventListeners(): void {
+    window.addEventListener('keydown', (e) => {
+      const key = e.key.toLowerCase();
+      const code = e.code.toLowerCase();
+
+      this.keys[key] = true;
+      this.keys[code] = true;
+
+      if (key === ' ') {
+        this.keys['space'] = true;
+      }
+      if (code === 'space') {
+        this.keys['space'] = true;
+      }
+
+      if (code === 'arrowup') this.keys['arrowup'] = true;
+      if (code === 'arrowdown') this.keys['arrowdown'] = true;
+      if (code === 'arrowleft') this.keys['arrowleft'] = true;
+      if (code === 'arrowright') this.keys['arrowright'] = true;
+
+      if ([' ', 'w', 'a', 's', 'd', '1', '2', '3', '4', '5', '6', '7', '8', '9'].includes(key)) {
+        e.preventDefault();
+      }
+    });
+
+    window.addEventListener('keyup', (e) => {
+      const key = e.key.toLowerCase();
+      const code = e.code.toLowerCase();
+
+      this.keys[key] = false;
+      this.keys[code] = false;
+
+      if (key === ' ') {
+        this.keys['space'] = false;
+      }
+      if (code === 'space') {
+        this.keys['space'] = false;
+      }
+
+      if (code === 'arrowup') this.keys['arrowup'] = false;
+      if (code === 'arrowdown') this.keys['arrowdown'] = false;
+      if (code === 'arrowleft') this.keys['arrowleft'] = false;
+      if (code === 'arrowright') this.keys['arrowright'] = false;
+    });
+
+    window.addEventListener('mousemove', (e) => {
+      if (this.engine && this.engine.canvas) {
+        const canvas = this.engine.canvas;
+        const rect = canvas.getBoundingClientRect();
+        const scaleX = canvas.width / rect.width;
+        const scaleY = canvas.height / rect.height;
+
+        this.mouse.x = (e.clientX - rect.left) * scaleX;
+        this.mouse.y = (e.clientY - rect.top) * scaleY;
+      }
+    });
+
+    window.addEventListener('mousedown', (e) => {
+      this.mouse.buttons[e.button] = true;
+    });
+
+    window.addEventListener('mouseup', (e) => {
+      this.mouse.buttons[e.button] = false;
+    });
+  }
+
+  /**
+   * Process input state (placeholder as processing happens via events).
+   * @param _deltaTime - Time elapsed
+   * @param _entities - Matching entities
+   */
+  process(_deltaTime: number, _entities: Entity[]): void {}
+
+  /**
+   * Update previous frame states. Should be called at the end of each frame.
+   */
+  updatePreviousStates(): void {
+    this.keysPrevious = {};
+    for (const key in this.keys) {
+      this.keysPrevious[key] = this.keys[key];
+    }
+    this.mouse.buttonsPrevious = {};
+    for (const button in this.mouse.buttons) {
+      this.mouse.buttonsPrevious[button] = this.mouse.buttons[button];
+    }
+  }
+
+  /**
+   * Check if a key is currently being held down.
+   * @param key - The key name or code
+   * @returns True if the key is pressed
+   */
+  isKeyPressed(key: string): boolean {
+    return this.keys[key.toLowerCase()] === true;
+  }
+
+  /**
+   * Check if a key was pressed in the current frame.
+   * @param key - The key name or code
+   * @returns True if the key was just pressed
+   */
+  isKeyJustPressed(key: string): boolean {
+    const keyLower = key.toLowerCase();
+    const isPressed = this.keys[keyLower] === true;
+    const wasPressed = this.keysPrevious[keyLower] === true;
+    return isPressed && !wasPressed;
+  }
+
+  /**
+   * Get the current mouse position in world coordinates.
+   * @returns The mouse coordinates in world space
+   */
+  getMousePosition(): { x: number; y: number } {
+    if (!this.engine) {
+      return { x: this.mouse.x, y: this.mouse.y };
+    }
+
+    const cameraEntity = this.engine.entities.find((e) => e.hasComponent(ComponentType.CAMERA));
+    if (!cameraEntity) {
+      return { x: this.mouse.x, y: this.mouse.y };
+    }
+
+    const camera = cameraEntity.getComponent<Camera>(ComponentType.CAMERA);
+    if (!camera) {
+      return { x: this.mouse.x, y: this.mouse.y };
+    }
+
+    const worldX = this.mouse.x + camera.x - camera.viewportWidth / 2;
+    const worldY = this.mouse.y + camera.y - camera.viewportHeight / 2;
+    return { x: worldX, y: worldY };
+  }
+
+  /**
+   * Check if a mouse button is currently being held down.
+   * @param button - The button index (0=left, 1=middle, 2=right)
+   * @returns True if the button is pressed
+   */
+  isMouseButtonPressed(button = 0): boolean {
+    return this.mouse.buttons[button] === true;
+  }
+
+  /**
+   * Check if a mouse button was pressed in the current frame.
+   * @param button - The button index
+   * @returns True if the button was just pressed
+   */
+  isMouseButtonJustPressed(button = 0): boolean {
+    const isPressed = this.mouse.buttons[button] === true;
+    const wasPressed = this.mouse.buttonsPrevious[button] === true;
+    return isPressed && !wasPressed;
+  }
+}

src/systems/MenuSystem.js

@@ -1,110 +0,0 @@
-import { System } from '../core/System.js';
-
-/**
- * System to handle game menus (start, pause)
- */
-export class MenuSystem extends System {
-  constructor(engine) {
-    super('MenuSystem');
-    this.requiredComponents = []; // No required components
-    this.priority = 1; // Run early
-    this.engine = engine;
-    this.ctx = engine.ctx;
-    this.gameState = 'start'; // 'start', 'playing', 'paused'
-    this.paused = false;
-  }
-
-  init(engine) {
-    super.init(engine);
-    this.setupInput();
-  }
-
-  setupInput() {
-    window.addEventListener('keydown', (e) => {
-      if (e.key === 'Escape' || e.key === 'p' || e.key === 'P') {
-        if (this.gameState === 'playing') {
-          this.togglePause();
-        }
-      }
-      if (e.key === 'Enter' || e.key === ' ') {
-        if (this.gameState === 'start') {
-          this.startGame();
-        } else if (this.gameState === 'paused') {
-          this.resumeGame();
-        }
-      }
-    });
-  }
-
-  startGame() {
-    this.gameState = 'playing';
-    this.paused = false;
-    if (!this.engine.running) {
-      this.engine.start();
-    }
-  }
-
-  togglePause() {
-    if (this.gameState === 'playing') {
-      this.gameState = 'paused';
-      this.paused = true;
-    } else if (this.gameState === 'paused') {
-      this.resumeGame();
-    }
-  }
-
-  resumeGame() {
-    this.gameState = 'playing';
-    this.paused = false;
-  }
-
-  process(_deltaTime, _entities) {
-    // Don't update game systems if paused or at start menu
-    if (this.gameState === 'paused' || this.gameState === 'start') {
-      // Pause all other systems
-      this.engine.systems.forEach(system => {
-        if (system !== this && system.name !== 'MenuSystem' && system.name !== 'UISystem') {
-          // Systems will check game state themselves
-        }
-      });
-    }
-  }
-
-  drawMenu() {
-    const ctx = this.ctx;
-    const width = this.engine.canvas.width;
-    const height = this.engine.canvas.height;
-
-    // Dark overlay
-    ctx.fillStyle = 'rgba(0, 0, 0, 0.7)';
-    ctx.fillRect(0, 0, width, height);
-
-    ctx.fillStyle = '#ffffff';
-    ctx.font = 'bold 48px Courier New';
-    ctx.textAlign = 'center';
-    ctx.textBaseline = 'middle';
-
-    if (this.gameState === 'start') {
-      ctx.fillText('SLIME GENESIS', width / 2, height / 2 - 100);
-      ctx.font = '24px Courier New';
-      ctx.fillText('Press ENTER or SPACE to Start', width / 2, height / 2);
-      ctx.font = '16px Courier New';
-      ctx.fillText('WASD: Move | Mouse: Aim | Click/Space: Attack', width / 2, height / 2 + 50);
-      ctx.fillText('Shift: Stealth | 1-9: Skills | ESC: Pause', width / 2, height / 2 + 80);
-    } else if (this.gameState === 'paused') {
-      ctx.fillText('PAUSED', width / 2, height / 2 - 50);
-      ctx.font = '24px Courier New';
-      ctx.fillText('Press ENTER or SPACE to Resume', width / 2, height / 2);
-      ctx.fillText('Press ESC to Pause/Unpause', width / 2, height / 2 + 40);
-    }
-  }
-
-  getGameState() {
-    return this.gameState;
-  }
-
-  isPaused() {
-    return this.paused || this.gameState === 'start';
-  }
-}
-

src/systems/MenuSystem.ts

@@ -0,0 +1,200 @@
+import { System } from '../core/System.ts';
+import { PixelFont } from '../core/PixelFont.ts';
+import { Palette } from '../core/Palette.ts';
+import { GameState, ComponentType, SystemName } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Engine } from '../core/Engine.ts';
+import type { UISystem } from './UISystem.ts';
+
+/**
+ * System responsible for managing game states (start, playing, paused, game over) and rendering menus.
+ */
+export class MenuSystem extends System {
+  gameState: GameState;
+  paused: boolean;
+  ctx: CanvasRenderingContext2D;
+
+  /**
+   * @param engine - The game engine instance
+   */
+  constructor(engine: Engine) {
+    super(SystemName.MENU);
+    this.requiredComponents = [];
+    this.priority = 1;
+    this.engine = engine;
+    this.ctx = engine.ctx;
+    this.gameState = GameState.START;
+    this.paused = false;
+  }
+
+  /**
+   * Initialize the menu system and set up input listeners.
+   * @param engine - The game engine instance
+   */
+  init(engine: Engine): void {
+    super.init(engine);
+    this.setupInput();
+  }
+
+  /**
+   * Set up keyboard event listeners for menu navigation and state toggling.
+   */
+  setupInput(): void {
+    window.addEventListener('keydown', (e) => {
+      if (e.key === 'Escape' || e.key === 'p' || e.key === 'P') {
+        if (this.gameState === GameState.PLAYING) {
+          this.togglePause();
+        }
+      }
+      if (e.key === 'Enter' || e.key === ' ') {
+        if (this.gameState === GameState.START) {
+          this.startGame();
+        } else if (this.gameState === GameState.PAUSED) {
+          this.resumeGame();
+        } else if (this.gameState === GameState.GAME_OVER) {
+          this.restartGame();
+        }
+      }
+    });
+  }
+
+  /**
+   * Transition the game state to Game Over.
+   */
+  showGameOver(): void {
+    this.gameState = GameState.GAME_OVER;
+    this.paused = true;
+  }
+
+  /**
+   * Restart the game by reloading the page.
+   */
+  restartGame(): void {
+    window.location.reload();
+  }
+
+  /**
+   * Transition the game state from Start menu to Playing.
+   */
+  startGame(): void {
+    this.gameState = GameState.PLAYING;
+    this.paused = false;
+    if (!this.engine.running) {
+      this.engine.start();
+    }
+  }
+
+  /**
+   * Toggle between Paused and Playing states.
+   */
+  togglePause(): void {
+    if (this.gameState === GameState.PLAYING) {
+      this.gameState = GameState.PAUSED;
+      this.paused = true;
+    } else if (this.gameState === GameState.PAUSED) {
+      this.resumeGame();
+    }
+  }
+
+  /**
+   * Transition the game state from Paused to Playing.
+   */
+  resumeGame(): void {
+    this.gameState = GameState.PLAYING;
+    this.paused = false;
+  }
+
+  /**
+   * Process menu logic (handled via events).
+   * @param _deltaTime - Time elapsed
+   * @param _entities - Filtered entities
+   */
+  process(_deltaTime: number, _entities: Entity[]): void {}
+
+  /**
+   * Draw the current menu screen based on the game state.
+   */
+  drawMenu(): void {
+    const ctx = this.ctx;
+    const width = this.engine.canvas.width;
+    const height = this.engine.canvas.height;
+
+    ctx.fillStyle = 'rgba(32, 21, 51, 0.8)';
+    ctx.fillRect(0, 0, width, height);
+
+    if (this.gameState === GameState.START) {
+      const title = 'SLIME GENESIS';
+      const titleW = PixelFont.getTextWidth(title, 2);
+      PixelFont.drawText(ctx, title, (width - titleW) / 2, height / 2 - 40, Palette.CYAN, 2);
+
+      const start = 'PRESS ENTER TO START';
+      const startW = PixelFont.getTextWidth(start, 1);
+      PixelFont.drawText(ctx, start, (width - startW) / 2, height / 2, Palette.WHITE, 1);
+
+      const instructions = [
+        'WASD: MOVE | CLICK: ATTACK',
+        'NUMS: SKILLS | ESC: PAUSE',
+        'COLLECT DNA TO EVOLVE',
+      ];
+
+      instructions.forEach((line, i) => {
+        const lineW = PixelFont.getTextWidth(line, 1);
+        PixelFont.drawText(
+          ctx,
+          line,
+          (width - lineW) / 2,
+          height / 2 + 25 + i * 10,
+          Palette.ROYAL_BLUE,
+          1
+        );
+      });
+    } else if (this.gameState === GameState.PAUSED) {
+      const paused = 'PAUSED';
+      const pausedW = PixelFont.getTextWidth(paused, 2);
+      PixelFont.drawText(ctx, paused, (width - pausedW) / 2, 20, Palette.SKY_BLUE, 2);
+
+      const resume = 'PRESS ENTER TO RESUME';
+      const resumeW = PixelFont.getTextWidth(resume, 1);
+      PixelFont.drawText(ctx, resume, (width - resumeW) / 2, 45, Palette.WHITE, 1);
+
+      const player = this.engine.getEntities().find((e) => e.hasComponent(ComponentType.EVOLUTION));
+      const uiSystem = this.engine.systems.find((s) => s.name === SystemName.UI) as
+        | UISystem
+        | undefined;
+
+      if (player && uiSystem) {
+        uiSystem.drawStats(player, 20, 80);
+        uiSystem.drawSkillProgress(player, width - 110, 80);
+        uiSystem.drawMutations(player, 20, 185);
+      }
+    } else if (this.gameState === GameState.GAME_OVER) {
+      const dead = 'YOU PERISHED';
+      const deadW = PixelFont.getTextWidth(dead, 2);
+      PixelFont.drawText(ctx, dead, (width - deadW) / 2, height / 2 - 30, Palette.WHITE, 2);
+
+      const sub = 'YOUR DNA SUSTAINS THE CYCLE';
+      const subW = PixelFont.getTextWidth(sub, 1);
+      PixelFont.drawText(ctx, sub, (width - subW) / 2, height / 2 - 5, Palette.ROYAL_BLUE, 1);
+
+      const restart = 'PRESS ENTER TO REBORN';
+      const restartW = PixelFont.getTextWidth(restart, 1);
+      PixelFont.drawText(ctx, restart, (width - restartW) / 2, height / 2 + 30, Palette.CYAN, 1);
+    }
+  }
+
+  /**
+   * Get the current game state identifier.
+   * @returns The game state string
+   */
+  getGameState(): GameState {
+    return this.gameState;
+  }
+
+  /**
+   * Check if the game is currently paused or in the start menu.
+   * @returns True if paused or at start
+   */
+  isPaused(): boolean {
+    return this.paused || this.gameState === GameState.START;
+  }
+}

src/systems/MovementSystem.js

@@ -1,62 +0,0 @@
-import { System } from '../core/System.js';
-
-export class MovementSystem extends System {
-  constructor() {
-    super('MovementSystem');
-    this.requiredComponents = ['Position', 'Velocity'];
-    this.priority = 10;
-  }
-
-  process(deltaTime, entities) {
-    entities.forEach(entity => {
-      const position = entity.getComponent('Position');
-      const velocity = entity.getComponent('Velocity');
-      const health = entity.getComponent('Health');
-            
-      if (!position || !velocity) return;
-
-      // Check if this is a projectile
-      const isProjectile = health && health.isProjectile;
-
-      // Apply velocity with max speed limit (skip for projectiles)
-      if (!isProjectile) {
-        const speed = Math.sqrt(velocity.vx * velocity.vx + velocity.vy * velocity.vy);
-        if (speed > velocity.maxSpeed) {
-          const factor = velocity.maxSpeed / speed;
-          velocity.vx *= factor;
-          velocity.vy *= factor;
-        }
-      }
-
-      // Update position
-      position.x += velocity.vx * deltaTime;
-      position.y += velocity.vy * deltaTime;
-
-      // Apply friction (skip for projectiles - they should maintain speed)
-      if (!isProjectile) {
-        const friction = 0.9;
-        velocity.vx *= Math.pow(friction, deltaTime * 60);
-        velocity.vy *= Math.pow(friction, deltaTime * 60);
-      }
-
-      // Boundary checking
-      const canvas = this.engine.canvas;
-      if (position.x < 0) {
-        position.x = 0;
-        velocity.vx = 0;
-      } else if (position.x > canvas.width) {
-        position.x = canvas.width;
-        velocity.vx = 0;
-      }
-
-      if (position.y < 0) {
-        position.y = 0;
-        velocity.vy = 0;
-      } else if (position.y > canvas.height) {
-        position.y = canvas.height;
-        velocity.vy = 0;
-      }
-    });
-  }
-}
-

src/systems/MovementSystem.ts

@@ -0,0 +1,119 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Position } from '../components/Position.ts';
+import type { Velocity } from '../components/Velocity.ts';
+import type { Health } from '../components/Health.ts';
+
+/**
+ * System responsible for moving entities based on their velocity and handling collisions.
+ */
+export class MovementSystem extends System {
+  constructor() {
+    super(SystemName.MOVEMENT);
+    this.requiredComponents = [ComponentType.POSITION, ComponentType.VELOCITY];
+    this.priority = 10;
+  }
+
+  /**
+   * Update the position of entities based on their velocity, applying friction and collision detection.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   * @param entities - Entities matching system requirements
+   */
+  process(deltaTime: number, entities: Entity[]): void {
+    entities.forEach((entity) => {
+      const position = entity.getComponent<Position>(ComponentType.POSITION);
+      const velocity = entity.getComponent<Velocity>(ComponentType.VELOCITY);
+      const health = entity.getComponent<Health>(ComponentType.HEALTH);
+
+      if (!position || !velocity) return;
+
+      if (velocity.lockTimer > 0) {
+        velocity.lockTimer -= deltaTime;
+        if (velocity.lockTimer <= 0) {
+          velocity.lockTimer = 0;
+          velocity.isLocked = false;
+        }
+      }
+
+      const isProjectile = health && health.isProjectile;
+
+      if (!isProjectile && !velocity.isLocked) {
+        const speed = Math.sqrt(velocity.vx * velocity.vx + velocity.vy * velocity.vy);
+        if (speed > velocity.maxSpeed) {
+          const factor = velocity.maxSpeed / speed;
+          velocity.vx *= factor;
+          velocity.vy *= factor;
+        }
+      }
+
+      const tileMap = this.engine.tileMap;
+
+      const nextX = position.x + velocity.vx * deltaTime;
+      if (tileMap && tileMap.isSolid(nextX, position.y)) {
+        velocity.vx = 0;
+        if (velocity.isLocked) {
+          velocity.lockTimer = 0;
+          velocity.isLocked = false;
+        }
+      } else {
+        position.x = nextX;
+      }
+
+      const nextY = position.y + velocity.vy * deltaTime;
+      if (tileMap && tileMap.isSolid(position.x, nextY)) {
+        velocity.vy = 0;
+        if (velocity.isLocked) {
+          velocity.lockTimer = 0;
+          velocity.isLocked = false;
+        }
+      } else {
+        position.y = nextY;
+      }
+
+      if (!isProjectile) {
+        const friction = velocity.isLocked ? 0.98 : 0.9;
+        velocity.vx *= Math.pow(friction, deltaTime * 60);
+        velocity.vy *= Math.pow(friction, deltaTime * 60);
+      }
+
+      if (tileMap) {
+        const mapWidth = tileMap.cols * tileMap.tileSize;
+        const mapHeight = tileMap.rows * tileMap.tileSize;
+
+        if (position.x < 0) {
+          position.x = 0;
+          velocity.vx = 0;
+        } else if (position.x > mapWidth) {
+          position.x = mapWidth;
+          velocity.vx = 0;
+        }
+
+        if (position.y < 0) {
+          position.y = 0;
+          velocity.vy = 0;
+        } else if (position.y > mapHeight) {
+          position.y = mapHeight;
+          velocity.vy = 0;
+        }
+      } else {
+        const canvas = this.engine.canvas;
+        if (position.x < 0) {
+          position.x = 0;
+          velocity.vx = 0;
+        } else if (position.x > canvas.width) {
+          position.x = canvas.width;
+          velocity.vx = 0;
+        }
+
+        if (position.y < 0) {
+          position.y = 0;
+          velocity.vy = 0;
+        } else if (position.y > canvas.height) {
+          position.y = canvas.height;
+          velocity.vy = 0;
+        }
+      }
+    });
+  }
+}

src/systems/MusicSystem.ts

@@ -0,0 +1,76 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType, GameState } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Engine } from '../core/Engine.ts';
+import type { Music } from '../components/Music.ts';
+import type { MenuSystem } from './MenuSystem.ts';
+
+/**
+ * System responsible for managing background music playback.
+ */
+export class MusicSystem extends System {
+  private audioContext: AudioContext | null;
+  private wasPaused: boolean;
+
+  constructor() {
+    super(SystemName.MUSIC);
+    this.requiredComponents = [ComponentType.MUSIC];
+    this.priority = 5;
+    this.audioContext = null;
+    this.wasPaused = false;
+  }
+
+  /**
+   * Initialize the audio context when system is added to engine.
+   */
+  init(engine: Engine): void {
+    super.init(engine);
+  }
+
+  /**
+   * Process music entities - ensures audio context exists and handles pause/resume.
+   */
+  process(_deltaTime: number, entities: Entity[]): void {
+    const menuSystem = this.engine.systems.find((s) => s.name === SystemName.MENU) as
+      | MenuSystem
+      | undefined;
+    const gameState = menuSystem ? menuSystem.getGameState() : GameState.PLAYING;
+    const isPaused = gameState === GameState.PAUSED;
+
+    entities.forEach((entity) => {
+      const music = entity.getComponent<Music>(ComponentType.MUSIC);
+      if (!music) return;
+
+      if (!this.audioContext) {
+        this.audioContext = new AudioContext();
+      }
+
+      if (isPaused && !this.wasPaused) {
+        music.pause();
+        this.wasPaused = true;
+      } else if (!isPaused && this.wasPaused) {
+        music.resume();
+        this.wasPaused = false;
+      }
+    });
+  }
+
+  /**
+   * Get or create the shared audio context.
+   */
+  getAudioContext(): AudioContext {
+    if (!this.audioContext) {
+      this.audioContext = new AudioContext();
+    }
+    return this.audioContext;
+  }
+
+  /**
+   * Resume audio context (required after user interaction).
+   */
+  resumeAudioContext(): void {
+    if (this.audioContext && this.audioContext.state === 'suspended') {
+      this.audioContext.resume();
+    }
+  }
+}