diff --git a/src/components/Music.ts b/src/components/Music.ts
new file mode 100644
index 0000000..35b9621
--- /dev/null
+++ b/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;
+        }
+      }
+    });
+  }
+}
diff --git a/src/components/SoundEffects.ts b/src/components/SoundEffects.ts
new file mode 100644
index 0000000..c605140
--- /dev/null
+++ b/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;
+  }
+}
diff --git a/src/config/MusicConfig.ts b/src/config/MusicConfig.ts
new file mode 100644
index 0000000..e1798b2
--- /dev/null
+++ b/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();
+  });
+}
diff --git a/src/config/SFXConfig.ts b/src/config/SFXConfig.ts
new file mode 100644
index 0000000..0ade875
--- /dev/null
+++ b/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);
+}
diff --git a/src/core/Constants.ts b/src/core/Constants.ts
index 400c38e..c12a14f 100644
--- a/src/core/Constants.ts
+++ b/src/core/Constants.ts
@@ -30,6 +30,8 @@ export enum ComponentType {
   STEALTH = 'Stealth',
   INTENT = 'Intent',
   INVENTORY = 'Inventory',
+  MUSIC = 'Music',
+  SOUND_EFFECTS = 'SoundEffects',
 }
 
 /**
@@ -79,4 +81,6 @@ export enum SystemName {
   SKILL = 'SkillSystem',
   STEALTH = 'StealthSystem',
   HEALTH_REGEN = 'HealthRegenerationSystem',
+  MUSIC = 'MusicSystem',
+  SOUND_EFFECTS = 'SoundEffectsSystem',
 }
diff --git a/src/core/Engine.ts b/src/core/Engine.ts
index 2010c0e..d795cb3 100644
--- a/src/core/Engine.ts
+++ b/src/core/Engine.ts
@@ -143,7 +143,7 @@ export class Engine {
       | 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];
+    const unskippedSystems = [SystemName.MENU, SystemName.UI, SystemName.RENDER, SystemName.MUSIC];
 
     this.systems.forEach((system) => {
       if (isPaused && !unskippedSystems.includes(system.name as SystemName)) {
diff --git a/src/core/Entity.ts b/src/core/Entity.ts
index dedd19a..ae39174 100644
--- a/src/core/Entity.ts
+++ b/src/core/Entity.ts
@@ -11,7 +11,6 @@ export class Entity {
   private components: Map<string, Component>;
   active: boolean;
 
-  // Optional dynamic properties for specific entity types
   owner?: number;
   startX?: number;
   startY?: number;
diff --git a/src/core/EventBus.ts b/src/core/EventBus.ts
index 7f4e935..6ae2906 100644
--- a/src/core/EventBus.ts
+++ b/src/core/EventBus.ts
@@ -11,6 +11,9 @@ export enum Events {
   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',
 }
 
 /**
diff --git a/src/core/Music.ts b/src/core/Music.ts
new file mode 100644
index 0000000..656fbf3
--- /dev/null
+++ b/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;
+  }
+}
diff --git a/src/core/PixelFont.ts b/src/core/PixelFont.ts
index ea0463a..d4cd05c 100644
--- a/src/core/PixelFont.ts
+++ b/src/core/PixelFont.ts
@@ -1,57 +1,58 @@
 /**
  * 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: Record<string, 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],
-};
+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.
@@ -80,7 +81,8 @@ export const PixelFont = {
 
     const chars = text.toUpperCase().split('');
     chars.forEach((char) => {
-      const glyph = FONT_DATA[char] || FONT_DATA['?'];
+      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) {
diff --git a/src/main.ts b/src/main.ts
index 61cd138..9971c67 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -15,6 +15,8 @@ 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 { Position } from './components/Position.ts';
 import { Velocity } from './components/Velocity.ts';
@@ -30,9 +32,13 @@ 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 { 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) {
@@ -42,6 +48,8 @@ if (!canvas) {
 
   engine.addSystem(new MenuSystem(engine));
   engine.addSystem(new InputSystem());
+  engine.addSystem(new MusicSystem());
+  engine.addSystem(new SoundEffectsSystem());
   engine.addSystem(new PlayerControllerSystem());
   engine.addSystem(new StealthSystem());
   engine.addSystem(new AISystem());
@@ -143,17 +151,50 @@ if (!canvas) {
     }
   }, 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;
-
-  canvas.addEventListener('click', () => {
-    canvas.focus();
-  });
+  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;
+      }
+    }
+  }
 }
diff --git a/src/skills/skills/WaterGun.ts b/src/skills/skills/WaterGun.ts
index 4572c5f..944c472 100644
--- a/src/skills/skills/WaterGun.ts
+++ b/src/skills/skills/WaterGun.ts
@@ -1,5 +1,6 @@
 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';
@@ -89,6 +90,12 @@ export class SlimeGun extends Skill {
     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;
   }
 }
diff --git a/src/systems/AISystem.ts b/src/systems/AISystem.ts
index a38b394..15a3744 100644
--- a/src/systems/AISystem.ts
+++ b/src/systems/AISystem.ts
@@ -33,7 +33,8 @@ export class AISystem extends System {
     const playerController = this.engine.systems.find(
       (s) => s.name === SystemName.PLAYER_CONTROLLER
     ) as PlayerControllerSystem | undefined;
-    const player = playerController ? playerController.getPlayerEntity() : null;
+    const player = playerController?.getPlayerEntity();
+    if (!player) return;
     const playerPos = player?.getComponent<Position>(ComponentType.POSITION);
     const config = GameConfig.AI;
 
diff --git a/src/systems/AbsorptionSystem.ts b/src/systems/AbsorptionSystem.ts
index fd57995..e7af650 100644
--- a/src/systems/AbsorptionSystem.ts
+++ b/src/systems/AbsorptionSystem.ts
@@ -143,6 +143,8 @@ export class AbsorptionSystem extends System {
         vfxSystem.createAbsorption(entityPos.x, entityPos.y);
       }
     }
+
+    this.engine.emit(Events.ABSORPTION, { entity });
   }
 
   /**
diff --git a/src/systems/MusicSystem.ts b/src/systems/MusicSystem.ts
new file mode 100644
index 0000000..439d31c
--- /dev/null
+++ b/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();
+    }
+  }
+}
diff --git a/src/systems/ProjectileSystem.ts b/src/systems/ProjectileSystem.ts
index 4c92f48..c9d91f4 100644
--- a/src/systems/ProjectileSystem.ts
+++ b/src/systems/ProjectileSystem.ts
@@ -75,6 +75,12 @@ export class ProjectileSystem extends System {
           if (targetHealthComp) {
             targetHealthComp.takeDamage(damage);
 
+            this.engine.emit(Events.PROJECTILE_IMPACT, {
+              x: position.x,
+              y: position.y,
+              damage,
+            });
+
             const vfxSystem = this.engine.systems.find((s) => s.name === SystemName.VFX) as
               | VFXSystem
               | undefined;
diff --git a/src/systems/RenderSystem.ts b/src/systems/RenderSystem.ts
index d9656cd..b989c22 100644
--- a/src/systems/RenderSystem.ts
+++ b/src/systems/RenderSystem.ts
@@ -179,7 +179,6 @@ export class RenderSystem extends System {
     let frames = spriteData[sprite.animationState as string] || spriteData[AnimationState.IDLE];
 
     if (!frames || !Array.isArray(frames)) {
-      // Fallback to default slime animation if data structure is unexpected
       frames = SpriteLibrary[EntityType.SLIME][AnimationState.IDLE];
     }
 
@@ -414,28 +413,24 @@ export class RenderSystem extends System {
    */
   drawGlowEffect(sprite: Sprite): void {
     const ctx = this.ctx;
-    const time = Date.now() * 0.001; // Time in seconds for pulsing
-    const pulse = 0.5 + Math.sin(time * 3) * 0.3; // Pulsing between 0.2 and 0.8
+    const time = Date.now() * 0.001;
+    const pulse = 0.5 + Math.sin(time * 3) * 0.3;
     const baseRadius = Math.max(sprite.width, sprite.height) / 2;
     const glowRadius = baseRadius + 4 + pulse * 2;
 
-    // Create radial gradient for soft glow
     const gradient = ctx.createRadialGradient(0, 0, baseRadius, 0, 0, glowRadius);
     gradient.addColorStop(0, `rgba(255, 255, 255, ${0.4 * pulse})`);
     gradient.addColorStop(0.5, `rgba(0, 230, 255, ${0.3 * pulse})`);
     gradient.addColorStop(1, 'rgba(0, 230, 255, 0)');
 
-    // Draw multiple layers for a softer glow effect
     ctx.save();
     ctx.globalCompositeOperation = 'screen';
 
-    // Outer glow layer
     ctx.fillStyle = gradient;
     ctx.beginPath();
     ctx.arc(0, 0, glowRadius, 0, Math.PI * 2);
     ctx.fill();
 
-    // Inner bright core
     const innerGradient = ctx.createRadialGradient(0, 0, 0, 0, 0, baseRadius * 0.6);
     innerGradient.addColorStop(0, `rgba(255, 255, 255, ${0.6 * pulse})`);
     innerGradient.addColorStop(1, 'rgba(0, 230, 255, 0)');
diff --git a/src/systems/SkillSystem.ts b/src/systems/SkillSystem.ts
index 6df2a26..107130c 100644
--- a/src/systems/SkillSystem.ts
+++ b/src/systems/SkillSystem.ts
@@ -1,6 +1,7 @@
 import { System } from '../core/System.ts';
 import { SkillRegistry } from '../skills/SkillRegistry.ts';
 import { SystemName, ComponentType } from '../core/Constants.ts';
+import { Events } from '../core/EventBus.ts';
 import type { Entity } from '../core/Entity.ts';
 import type { Skills } from '../components/Skills.ts';
 import type { Intent } from '../components/Intent.ts';
@@ -55,6 +56,7 @@ export class SkillSystem extends System {
       if (skills) {
         skills.setCooldown(skillId, skill.cooldown);
       }
+      this.engine.emit(Events.SKILL_COOLDOWN_STARTED, { skillId });
     }
   }
 }
diff --git a/src/systems/SoundEffectsSystem.ts b/src/systems/SoundEffectsSystem.ts
new file mode 100644
index 0000000..bd4c753
--- /dev/null
+++ b/src/systems/SoundEffectsSystem.ts
@@ -0,0 +1,105 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import { Events } from '../core/EventBus.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Engine } from '../core/Engine.ts';
+import type { SoundEffects } from '../components/SoundEffects.ts';
+import type { MusicSystem } from './MusicSystem.ts';
+
+/**
+ * System responsible for managing sound effects playback.
+ * Follows ECS pattern: system processes entities with SoundEffects component.
+ * Listens to game events and plays appropriate sound effects.
+ */
+export class SoundEffectsSystem extends System {
+  private sfxEntity: Entity | null;
+
+  constructor() {
+    super(SystemName.SOUND_EFFECTS);
+    this.requiredComponents = [ComponentType.SOUND_EFFECTS];
+    this.priority = 5;
+    this.sfxEntity = null;
+  }
+
+  /**
+   * Initialize event listeners when system is added to engine.
+   */
+  init(engine: Engine): void {
+    super.init(engine);
+
+    this.engine.on(Events.ATTACK_PERFORMED, () => {
+      this.playSound('attack');
+    });
+
+    this.engine.on(Events.DAMAGE_DEALT, () => {
+      this.playSound('damage');
+    });
+
+    this.engine.on(Events.ABSORPTION, () => {
+      this.playSound('absorb');
+    });
+
+    this.engine.on(Events.SKILL_LEARNED, () => {
+      this.playSound('skill');
+    });
+
+    this.engine.on(Events.SKILL_COOLDOWN_STARTED, () => {
+      this.playSound('skill');
+    });
+
+    this.engine.on(Events.PROJECTILE_CREATED, () => {
+      this.playSound('shoot');
+    });
+
+    this.engine.on(Events.PROJECTILE_IMPACT, () => {
+      this.playSound('impact');
+    });
+  }
+
+  /**
+   * Process sound effect entities - ensures audio context is available.
+   */
+  process(_deltaTime: number, entities: Entity[]): void {
+    entities.forEach((entity) => {
+      const sfx = entity.getComponent<SoundEffects>(ComponentType.SOUND_EFFECTS);
+      if (!sfx) return;
+
+      if (!this.sfxEntity) {
+        this.sfxEntity = entity;
+      }
+
+      if (!sfx.audioContext) {
+        const musicSystem = this.engine.systems.find((s) => s.name === SystemName.MUSIC) as
+          | MusicSystem
+          | undefined;
+        if (musicSystem) {
+          sfx.audioContext = musicSystem.getAudioContext();
+        }
+      }
+    });
+  }
+
+  /**
+   * Play a sound effect from any entity with SoundEffects component.
+   * @param soundName - The name of the sound to play
+   */
+  playSound(soundName: string): void {
+    if (this.sfxEntity) {
+      const sfx = this.sfxEntity.getComponent<SoundEffects>(ComponentType.SOUND_EFFECTS);
+      if (sfx) {
+        sfx.play(soundName);
+        return;
+      }
+    }
+
+    const entities = this.engine.getEntities();
+    for (const entity of entities) {
+      const sfx = entity.getComponent<SoundEffects>(ComponentType.SOUND_EFFECTS);
+      if (sfx) {
+        this.sfxEntity = entity;
+        sfx.play(soundName);
+        break;
+      }
+    }
+  }
+}
diff --git a/vite.config.js b/vite.config.js
index 5f09b7e..3dfac46 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,25 +1,27 @@
 import { defineConfig } from 'vite';
 
 export default defineConfig({
-    build: {
-        minify: 'terser',
-        terserOptions: {
-            compress: {
-                drop_console: true,
-                drop_debugger: true,
-            },
-            mangle: {
-                toplevel: true,
-            },
-            format: {
-                comments: false,
-            },
-        },
-        rollupOptions: {
-            output: {
-                manualChunks: undefined,
-            },
-        },
-        sourcemap: false,
+  build: {
+    minify: 'terser',
+    terserOptions: {
+      ecma: 2020,
+      compress: {
+        drop_console: true,
+        drop_debugger: true,
+      },
+      mangle: {
+        toplevel: true,
+        properties: true,
+      },
+      format: {
+        comments: false,
+      },
     },
+    rollupOptions: {
+      output: {
+        manualChunks: undefined,
+      },
+    },
+    sourcemap: false,
+  },
 });