/**** 
* Classes
****/
var EngineParticle = Container.expand(function () {
	var self = Container.call(this);
	var particleGraphics = self.attachAsset('engineParticle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	particleGraphics.rotation = Math.random() * Math.PI * 2;
	particleGraphics.blendMode = 1;
	self.speed = 20;
	self.move = function () {
		self.y += self.speed;
		self.alpha -= 0.03;
		if (self.alpha <= 0) {
			self.destroy();
		}
	};
});
var Powerup = Container.expand(function (type) {
	var self = Container.call(this);
	self.type = type;
	var powerupGraphics;
	switch (type) {
		case 'extraBullet':
			powerupGraphics = LK.getAsset('extraBulletPowerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 'shield':
			powerupGraphics = LK.getAsset('shieldPowerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 'speed':
			powerupGraphics = LK.getAsset('speedPowerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 'health':
			powerupGraphics = LK.getAsset('healthPowerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 'missileSpeed':
			powerupGraphics = LK.getAsset('missileSpeedPowerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 'curveBullet':
			powerupGraphics = LK.getAsset('curveBulletPowerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 'scoreMultiplier':
			powerupGraphics = LK.getAsset('scoreMultiplierPowerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		default:
			powerupGraphics = LK.getAsset('powerup', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
	}
	self.addChild(powerupGraphics);
	self.speed = 3;
	self.move = function () {
		self.y += self.speed;
	};
});
var HealthBar = Container.expand(function (maxHealth, color) {
	var self = Container.call(this);
	var barGraphics = LK.getAsset('healthBar', {
		anchorX: 0.5,
		anchorY: 1
	});
	barGraphics.tint = color;
	self.addChild(barGraphics);
	self.maxHealth = maxHealth;
	self.currentHealth = maxHealth;
	self.updateHealth = function (newHealth) {
		self.currentHealth = newHealth;
		barGraphics.scale.x = self.currentHealth / self.maxHealth;
	};
	self.intersectable = false;
});
var HeroBullet = Container.expand(function (acceleration, enemies, curveBullet) {
	var self = Container.call(this);
	var bulletGraphics = LK.getAsset('heroBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(bulletGraphics);
	self.speed = 10;
	self.acceleration = 0.2;
	self.curveBullet = curveBullet || 0;
	self.move = function () {
		self.speed += self.acceleration;
		var speedX = 0;
		var speedY = -self.speed;
		if (self.curveBullet > 0 && enemies.length > 0) {
			var nearestEnemy = enemies.reduce(function (nearest, enemy) {
				var dx = self.x - enemy.x;
				var dy = self.y - enemy.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				return distance < nearest.distance ? {
					enemy: enemy,
					distance: distance
				} : nearest;
			}, {
				enemy: null,
				distance: Infinity
			});
			if (nearestEnemy.enemy) {
				var angle = Math.atan2(nearestEnemy.enemy.y - self.y, nearestEnemy.enemy.x - self.x);
				speedX = self.speed * Math.cos(angle) * self.curveBullet * 0.1;
				speedY = -self.speed;
				self.rotation = Math.atan2(speedY, speedX) + Math.PI / 2;
			}
		}
		self.x += speedX;
		self.y += speedY;
	};
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = LK.getAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics.rotation = Math.PI;
	self.addChild(bulletGraphics);
	self.speed = 5;
	self.move = function () {
		self.x += self.speedX;
		self.y += self.speedY;
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	self.heroGraphics = LK.getAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(self.heroGraphics);
	self.health = 100;
	self.healthBar = self.addChild(new HealthBar(100, 0x00ff00));
	self.healthBar.y = -self.heroGraphics.height / 2 - 50;
	self.healthBar.updateHealth(self.health);
	self.shieldBar = self.addChild(new HealthBar(10, 0x4682B4));
	self.shieldBar.y = self.healthBar.y - 30;
	self.shieldBar.visible = false;
	self.shieldEffect = LK.getAsset('shieldEffect', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.shieldEffect.visible = false;
	self.shieldEffect.alpha = 0.5;
	self.addChildAt(self.shieldEffect, 1);
	self.updateShield = function () {
		if (self.shield > 0) {
			self.shieldBar.visible = true;
			self.shieldEffect.visible = true;
			self.shieldBar.updateHealth(self.shield);
			self.shieldEffect.alpha = self.shield / 10 / 2;
		} else {
			self.shieldBar.visible = false;
			self.shieldEffect.visible = false;
			self.shieldBar.updateHealth(0);
		}
	};
	self.updateShield();
	self.hitEffectCounter = 0;
	self.curveBullet = 0;
	self.shield = 0;
	self.fireRate = 30;
	self.bulletCount = 1;
	self.acceleration = 1;
	self.scoreMultiplier = 1;
});
var Enemy = Container.expand(function (currentWave) {
	var self = Container.call(this);
	var enemyGraphics = LK.getAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(enemyGraphics);
	self.speed = 6;
	self.targetSpeed = 6;
	self.health = 30 + currentWave * 10;
	self.targetY = Math.random() * (2732 / 3) + enemyGraphics.height;
	self.sidewaysOffset = Math.random() * 60;
	self.healthBar = self.addChild(new HealthBar(self.health, 0xff0000));
	self.healthBar.y = -enemyGraphics.height / 2 - 50;
	self.healthBar.updateHealth(self.health);
	self.hitEffectCounter = 0;
	self.tickOffset = Math.floor(Math.random() * 90);
	self.move = function () {
		if (self.y < self.targetY) {
			self.speed = Math.min(self.targetSpeed, self.speed + 0.5);
			self.y += self.speed;
		}
		self.x += Math.sin((LK.ticks + self.sidewaysOffset) / 30) * 5;
		if (self.x < 0) {
			self.x = 0;
		}
		if (self.x > 2048 - enemyGraphics.width) {
			self.x = 2048 - enemyGraphics.width;
		}
	};
});
var StarField = Container.expand(function () {
	var self = Container.call(this);
	var starGraphics = LK.getAsset('star', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	starGraphics.rotation = Math.random() * Math.PI * 2;
	starGraphics.blendMode = 1;
	self.addChild(starGraphics);
	self.speed = (Math.random() * 2 + 1) * 2;
	self.alpha = self.speed / 4;
	self.move = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = -100;
			self.x = Math.random() * 2048;
			self.speed = Math.random() * 2 + 1;
			self.alpha = self.speed / 3;
		}
	};
});

/**** 
* Initialize Game
****/
var game = new LK.Game({
	backgroundColor: 0x1c0921
});

/**** 
* Game Code
****/
var background = LK.getAsset('background', {
	anchorX: 0.5,
	anchorY: 1
});
background.x = 2048 / 2;
background.y = 2732;
background.alpha = 0.8;
game.addChild(background);
var starField = [];
for (var i = 0; i < 100; i++) {
	var star = new StarField();
	star.x = Math.random() * 2048;
	star.y = Math.random() * 2732;
	starField.push(star);
	game.addChild(star);
}
var hero = game.addChild(new Hero());
hero.x = 1024;
hero.y = 2400;
hero.previousX = hero.x;
var particles = [];
var enemies = [];
var heroBullets = [];
var enemyBullets = [];
var powerups = [];
var score = 0;
var currentWave = 0;
var allEnemiesKilled = true;
var scoreText = new Text2('0', {
	size: 100,
	font: "'GillSans-Bold',Impact,'Arial Black',Tahoma",
	fill: "#ffffff",
	defaultFont: "'Arial', sans-serif",
	dropShadow: true,
	dropShadowColor: '#000000',
	dropShadowBlur: 4,
	dropShadowAngle: Math.PI / 6,
	dropShadowDistance: 6
});
scoreText.anchor.set(0.5, 0);
LK.gui.topCenter.addChild(scoreText);
var powerupLabel = new Text2('', {
	size: 64,
	font: "Verdana",
	fill: "#ffffff",
	dropShadow: true,
	dropShadowColor: '#000000',
	dropShadowBlur: 4,
	dropShadowAngle: Math.PI / 6,
	dropShadowDistance: 6
});
powerupLabel.anchor.set(0.5, 0);
LK.gui.topCenter.addChild(powerupLabel);
powerupLabel.y = scoreText.height + 10;
powerupLabel.visible = false;
function spawnWave() {
	for (var i = 0; i < 5; i++) {
		var enemy = new Enemy(currentWave);
		enemy.x = Math.random() * 2048;
		enemy.y = -100 - i * 100;
		enemies.push(enemy);
		game.addChild(enemy);
	}
	allEnemiesKilled = false;
	var powerupTypes = ['health', 'speed', 'shield'];
	if (hero.bulletCount < 5) {
		powerupTypes.push('extraBullet');
	}
	if (hero.fireRate > 20) {
		powerupTypes.push('powerup');
	}
	powerupTypes.push('missileSpeed', 'curveBullet', 'scoreMultiplier');
	for (var i = 0; i < 3; i++) {
		var powerupType = powerupTypes[Math.floor(Math.random() * powerupTypes.length)];
		var powerup = new Powerup(powerupType);
		powerup.x = (i + 1) * 2048 / 4;
		powerup.y = -100;
		powerups.push(powerup);
		game.addChild(powerup);
	}
	var waveText = new Text2('Wave ' + currentWave, {
		size: 200,
		font: "'GillSans-Bold',Impact,'Arial Black',Tahoma",
		fill: "#ffffff",
		dropShadow: true,
		dropShadowColor: '#000000',
		dropShadowBlur: 4,
		dropShadowAngle: Math.PI / 6,
		dropShadowDistance: 6
	});
	waveText.anchor.set(0.5, 0.5);
	waveText.x = 2048 / 2;
	waveText.y = 2732 / 2;
	game.addChild(waveText);
	LK.setTimeout(function () {
		waveText.destroy();
	}, 2000);
}
function fireHeroBullet(enemies, curveBullet) {
	var angleStep = Math.PI / (hero.bulletCount + 1);
	for (var i = 0; i < hero.bulletCount; i++) {
		var bullet = new HeroBullet(hero.acceleration, enemies, curveBullet);
		bullet.x = hero.x + Math.cos((i + 1) * angleStep) * 100;
		bullet.y = hero.y - Math.sin((i + 1) * angleStep) * 100;
		heroBullets.push(bullet);
		game.addChild(bullet);
	}
}
function fireEnemyBullet(enemy) {
	var bullet = new EnemyBullet();
	bullet.x = enemy.x;
	bullet.y = enemy.y + 50;
	var angle = Math.atan2(hero.y - bullet.y, hero.x - bullet.x);
	bullet.speedX = bullet.speed * Math.cos(angle);
	bullet.speedY = bullet.speed * Math.sin(angle);
	bullet.rotation = angle - Math.PI / 2;
	enemyBullets.push(bullet);
	game.addChild(bullet);
}
function updateGameObjects() {
	enemies.forEach(function (enemy, index) {
		enemy.move();
	});
	for (var index = heroBullets.length - 1; index >= 0; index--) {
		var bullet = heroBullets[index];
		bullet.move();
		if (bullet.y < 0) {
			bullet.destroy();
			heroBullets.splice(index, 1);
		}
	}
	for (var index = enemyBullets.length - 1; index >= 0; index--) {
		var bullet = enemyBullets[index];
		bullet.move();
		if (bullet.y > 2732 || bullet.x < 0 || bullet.x > 2048) {
			bullet.destroy();
			enemyBullets.splice(index, 1);
		}
	}
	for (var index = powerups.length - 1; index >= 0; index--) {
		var powerup = powerups[index];
		powerup.move();
		if (powerup.y > 2732) {
			powerup.destroy();
			powerups.splice(index, 1);
		}
	}
}
function checkCollisions() {
	for (var hIndex = heroBullets.length - 1; hIndex >= 0; hIndex--) {
		var heroBullet = heroBullets[hIndex];
		for (var eIndex = enemies.length - 1; eIndex >= 0; eIndex--) {
			var enemy = enemies[eIndex];
			if (heroBullet && enemy && heroBullet.intersects(enemy)) {
				heroBullet.destroy();
				heroBullets.splice(hIndex, 1);
				heroBullet = null;
				enemy.health -= 10;
				enemy.healthBar.updateHealth(enemy.health);
				enemy.hitEffectCounter = 10;
				enemy.speed = -5;
				enemy.y -= 7;
				LK.effects.flashObject(enemy, 0xff0000, 1000);
				if (enemy.health <= 0) {
					enemy.destroy();
					enemies.splice(eIndex, 1);
					score += Math.floor(100 * hero.scoreMultiplier);
					LK.setScore(score);
					scoreText.setText(LK.getScore());
					if (enemies.length === 0) {
						allEnemiesKilled = true;
					}
				}
			}
		}
	}
	for (var index = enemyBullets.length - 1; index >= 0; index--) {
		var enemyBullet = enemyBullets[index];
		if (enemyBullet.intersects(hero)) {
			enemyBullet.destroy();
			enemyBullets.splice(index, 1);
			if (hero.shield > 0) {
				hero.shield--;
				hero.updateShield();
				LK.effects.flashObject(hero.shieldEffect, 0xff0000, 1000);
			} else {
				hero.health -= 10;
				hero.healthBar.updateHealth(hero.health);
				hero.hitEffectCounter = 10;
				LK.effects.flashObject(hero, 0xff0000, 1000);
			}
		}
	}
	for (var index = powerups.length - 1; index >= 0; index--) {
		var powerup = powerups[index];
		if (powerup && powerup.intersects(hero)) {
			for (var i = powerups.length - 1; i >= 0; i--) {
				powerups[i].destroy();
			}
			powerups = [];
			switch (powerup.type) {
				case 'powerup':
					hero.fireRate = Math.max(5, hero.fireRate * 0.9);
					powerupLabel.setText('+10% Rate of Fire');
					break;
				case 'health':
					hero.health = 100;
					hero.healthBar.updateHealth(hero.health);
					powerupLabel.setText('Health restored');
					break;
				case 'speed':
					hero.speed *= 1.1;
					powerupLabel.setText('+10% Speed');
					break;
				case 'shield':
					hero.shield = 10;
					hero.updateShield();
					powerupLabel.setText('Shield');
					break;
				case 'extraBullet':
					hero.bulletCount++;
					powerupLabel.setText('Extra Bullet');
					break;
				case 'missileSpeed':
					hero.acceleration *= 1.1;
					powerupLabel.setText('Missile Speed +10%');
					break;
				case 'curveBullet':
					hero.curveBullet += 1;
					powerupLabel.setText('Enhancing Bullet Homing');
					break;
				case 'scoreMultiplier':
					hero.scoreMultiplier += 0.1;
					powerupLabel.setText('Score Multiplier +10%');
					break;
			}
			powerupLabel.visible = true;
			LK.setTimeout(function () {
				powerupLabel.visible = false;
			}, 3000);
		}
	}
}
var targetPosition = {
	x: hero.x,
	y: hero.y
};
game.on('down', function (obj) {
	targetPosition = obj.event.getLocalPosition(game);
});
game.on('move', function (obj) {
	targetPosition = obj.event.getLocalPosition(game);
});
function moveHeroTowardsTarget() {
	var dx = targetPosition.x - hero.x;
	var dy = targetPosition.y - hero.y;
	var distance = Math.sqrt(dx * dx + dy * dy);
	var maxSpeed = 15;
	if (distance > maxSpeed) {
		var angle = Math.atan2(dy, dx);
		var oldX = hero.x;
		hero.x += maxSpeed * Math.cos(angle);
		hero.y += maxSpeed * Math.sin(angle);
		var deltaX = hero.x - oldX;
		var targetRotation = deltaX !== 0 ? Math.sign(deltaX) * Math.PI / 30 : 0;
		hero.heroGraphics.rotation += (targetRotation - hero.heroGraphics.rotation) * 0.1;
	} else {
		var oldX = hero.x;
		hero.x = targetPosition.x;
		hero.y = targetPosition.y;
		var deltaX = hero.x - oldX;
		var targetRotation = deltaX !== 0 ? Math.sign(deltaX) * Math.PI / 30 : 0;
		hero.heroGraphics.rotation += (targetRotation - hero.heroGraphics.rotation) * 0.1;
	}
}
function handleTick() {
	background.y += 0.5;
	if (background.y >= background.height) {
		background.y = 2732;
	}
	moveHeroTowardsTarget();
	var particle = new EngineParticle();
	particle.x = hero.x;
	particle.y = hero.y + 75;
	particles.push(particle);
	game.addChild(particle);
	updateGameObjects();
	checkCollisions();
	particles.forEach(function (particle, index) {
		particle.move();
		if (particle.alpha <= 0) {
			particles.splice(index, 1);
		}
	});
	starField.forEach(function (star) {
		star.move();
	});
	if (allEnemiesKilled) {
		currentWave++;
		spawnWave();
	}
	if (hero.health <= 0) {
		LK.showGameOver();
	}
	if (LK.ticks % Math.floor(hero.fireRate) === 0) {
		fireHeroBullet(enemies, hero.curveBullet);
		heroBullets.forEach(function (bullet) {
			game.addChildAt(bullet, game.getChildIndex(hero));
		});
	}
	enemies.forEach(function (enemy, index) {
		if ((LK.ticks + enemy.tickOffset) % Math.max(60, 180 - currentWave * 5) === 0) {
			fireEnemyBullet(enemy);
		}
	});
}
LK.on('tick', handleTick);

===================================================================
--- original.js
+++ change.js
@@ -244,9 +244,9 @@
 /**** 
 * Initialize Game
 ****/
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x1c0921
 });
 
 /**** 
 * Game Code