/**** 
* Classes
****/ 
var Background = Container.expand(function () {
	var self = Container.call(this);
	var bg1 = self.attachAsset('background', {});
	var bg2 = self.attachAsset('background', {});
	bg1.width = bg2.width = 2048;
	bg1.height = bg2.height = 2732;
	bg2.y = -2732;
	self.addChild(bg1);
	self.addChild(bg2);
	self._move_migrated = function () {
		bg1.y += 1;
		bg2.y += 1;
		if (bg1.y >= 2732) {
			bg1.y = -2732;
		}
		if (bg2.y >= 2732) {
			bg2.y = -2732;
		}
	};
});
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	var trail = LK.getAsset('trail', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var cloudGraphics = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedY = 1;
	self._move_migrated = function () {
		var cloudSpeed = 3.5;
		self.y += cloudSpeed;
		if (self.y > 2732) {
			self.y = -cloudGraphics.height;
		}
	};
});
var Enemy = Container.expand(function (hero) {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedY = 2;
	self.hero = hero;
	self.lifebar = self.attachAsset('lifebar', {
		anchorX: 0.5
	});
	self.lifebar.y = -self.lifebar.height - 100;
	self.life = 100;
	self._move_migrated = function () {
		var dx = this.hero.x - this.x;
		var dy = this.hero.y - this.y;
		var angle = Math.atan2(dy, dx);
		var speedMultiplier = 1 + Math.floor(LK.ticks / 7200);
		self.x += (Math.cos(angle) * self.speedY + Math.sin(LK.ticks / 60) * 5) * speedMultiplier;
		self.y += Math.sin(angle) * self.speedY * speedMultiplier;
		self.lifebar.scale.x = self.life / 100;
	};
});
var EnemyBoss = Container.expand(function (hero) {
	var self = Container.call(this);
	var bossGraphics = self.attachAsset('enemyBoss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bossGraphics.tint = 0xFFFFFF * (0.5 + Math.random() * 0.5);
	self.speedY = 3;
	self.hero = hero;
	self.lifebar = self.attachAsset('lifebar', {
		anchorX: 0.5
	});
	self.lifebar.y = -self.lifebar.height - 170;
	self.lifebar.x -= 10;
	self.life = 500;
	self._move_migrated = function () {
		var dx = this.hero.x - this.x + (Math.random() - 0.5) * 100;
		var dy = this.hero.y - this.y + (Math.random() - 0.5) * 100;
		var angle = Math.atan2(dy, dx);
		var newX = self.x + Math.cos(angle) * self.speedY + Math.sin(LK.ticks / 60) * 5;
		var newY = self.y + Math.sin(angle) * self.speedY;
		newX = Math.max(bossGraphics.width / 2, Math.min(newX, 2048 - bossGraphics.width / 2));
		newY = Math.max(bossGraphics.height / 2, Math.min(newY, 2732 - bossGraphics.height / 2));
		self.x = newX;
		self.y = newY;
		self.lifebar.scale.x = self.life / 500;
		if (self.life <= 0) {
			// Add explosion effect
			var explosion = new Explosion(self.x, self.y);
			game.addChild(explosion);
			LK.getSound('explosion').play();
			self.destroy();
		}
	};
	self.shoot = function () {};
	self.on('tick', function () {
		self._move_migrated();
		self.shoot();
	});
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self._move_migrated = function () {
		self.y += self.speed;
	};
});
var Explosion = Container.expand(function (x, y) {
	var self = Container.call(this);
	var explosionGraphics = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = x;
	self.y = y;
	self.scale.set(0.1);
	self.alpha = 1;
	// Animate explosion
	self.update = function () {
		self.scale.x += 0.1;
		self.scale.y += 0.1;
		self.alpha -= 0.05;
		if (self.alpha <= 0) {
			self.destroy();
		}
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var trail = self.attachAsset('trail', {
		anchorX: 1,
		anchorY: 0.5
	});
	trail.rotation = Math.PI / 4;
	trail.y = heroGraphics.height / 2 - 80;
	trail.x = -heroGraphics.width / 2 + 30;
	trail.flicker = true;
	trail.flickerSpeed = 0.1;
	trail.flickerMinAlpha = 0.3;
	trail.flickerMaxAlpha = 0.7;
	LK.on('tick', function () {
		if (trail.flicker) {
			trail.alpha += trail.flickerSpeed;
			if (trail.alpha < trail.flickerMinAlpha || trail.alpha > trail.flickerMaxAlpha) {
				trail.flickerSpeed *= -1;
				trail.alpha = Math.max(trail.flickerMinAlpha, Math.min(trail.alpha, trail.flickerMaxAlpha));
			}
		}
	});
	self.movementDirection = 1;
	self.movementSpeed = 0.5;
	self.movementRange = 100;
	self.originalX = 2048 / 2;
	self.x = self.originalX;
	self.updateMovement = function () {
		self.x += self.movementDirection * self.movementSpeed;
		if (self.x < self.originalX - self.movementRange || self.x > self.originalX + self.movementRange) {
			self.movementDirection *= -1;
		}
	};
});
var HeroBullet = Container.expand(function (hero) {
	var self = Container.call(this);
	self.bulletGraphics = self.attachAsset('heroBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.creationTick = LK.ticks;
	self.bulletGraphics.tint = 0x6EC1E4;
	self.speed = -1.5;
	self.damage = 1;
	self.isShot = false;
	self.flickerSpeed = 0.7;
	self.flickerMinAlpha = 0.5;
	self.flickerMaxAlpha = 1;
	self._move_migrated = function () {
		self.x += self.speedX * self.scale.x * self.scale.x;
		self.y += self.speedY * self.scale.y * self.scale.y;
		self.rotation += LK.ticks * 0.01;
		self.damage = self.scale.x * self.scale.y;
		var holdDuration = (LK.ticks - self.creationTick) % 240;
		if (holdDuration < 120) {
			var sizeMultiplier = 1 + holdDuration / 40;
		} else {
			var sizeMultiplier = 4 - (holdDuration - 120) / 40;
		}
		self.scale.x = self.scale.y = Math.max(1, sizeMultiplier);
		if (self.flicker) {
			self.alpha += self.flickerSpeed;
			if (self.alpha <= self.flickerMinAlpha || self.alpha >= self.flickerMaxAlpha) {
				self.flickerSpeed *= -1;
			}
			self.alpha = Math.max(self.flickerMinAlpha, Math.min(self.alpha, self.flickerMaxAlpha));
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
var getReadyMessage = new Text2('Get Ready!', {
	size: 200,
	fill: '#ffffff',
	align: 'center'
});
getReadyMessage.anchor.set(0.8, 0.8);
getReadyMessage.x = 2048 / 2;
getReadyMessage.y = 2732 / 3 - 100;
getReadyMessage.alpha = 0;
LK.gui.addChild(getReadyMessage);
var fadeInInterval = LK.setInterval(function () {
	getReadyMessage.alpha += 0.05;
	if (getReadyMessage.alpha >= 1) {
		LK.clearInterval(fadeInInterval);
	}
}, 1000 / 60);
var getSetMessage = new Text2('(tap or hold for super shot!)', {
	size: 50,
	fill: '#ffffff',
	align: 'center'
});
getSetMessage.anchor.set(0.8, 0.8);
getSetMessage.x = 2048 / 2 - 90;
getSetMessage.y = getReadyMessage.y + 100;
LK.gui.addChild(getSetMessage);
LK.setTimeout(function () {
	var fadeOutInterval = LK.setInterval(function () {
		getReadyMessage.alpha -= 0.05;
		if (getReadyMessage.alpha <= 0) {
			LK.clearInterval(fadeOutInterval);
			getReadyMessage.destroy();
		}
	}, 1000 / 60);
	getSetMessage.destroy();
}, 3000);
var enemies = [];
var enemiesSpawnedCount = 0;
var background = game.addChild(new Background());
background.alpha = 0.3;
game.spawnEnemy = function () {
	var enemy;
	if (enemiesSpawnedCount % 10 === 0 && enemiesSpawnedCount !== 0) {
		enemy = new EnemyBoss(hero);
		enemy.scale.x *= 1 * (1 + enemiesSpawnedCount / 100);
		enemy.scale.y *= 1 * (1 + enemiesSpawnedCount / 100);
		enemy.speedY *= 1 * (1 + enemiesSpawnedCount / 100);
		enemy.life *= 1 * (0.5 + enemiesSpawnedCount / 100);
	} else {
		enemy = new Enemy(hero);
	}
	enemy.x = Math.random() * 2048;
	enemy.y = -enemy.height;
	enemies.push(enemy);
	game.addChild(enemy);
	enemiesSpawnedCount++;
};
var enemySpawnTicker = 0;
LK.on('tick', function () {
	// Update explosions
	for (var i = 0; i < game.children.length; i++) {
		if (game.children[i] instanceof Explosion) {
			game.children[i].update();
		}
	}
	var spawnRate = Math.max(30, 120 - Math.floor(LK.ticks / 3600));
	if (enemySpawnTicker++ % spawnRate === 0) {
		game.spawnEnemy();
	}
});
game.on('up', function (x, y, obj) {
	LK.getSound('ha').play();
	if (currentBullet) {
		var pos = game.toLocal(obj.global);
		var dx = pos.x - hero.x;
		var dy = pos.y - hero.y;
		var angle = Math.atan2(dy, dx);
		currentBullet.isShot = true;
		currentBullet.speedX = Math.cos(angle) * 15;
		currentBullet.speedY = Math.sin(angle) * 15;
		hero.rotation = angle;
		heroBullets.push(currentBullet);
		currentBullet = null;
	}
});
LK.on('tick', function () {
	hero.updateMovement();
	background._move_migrated();
	if (currentBullet) {
		var holdDuration = LK.ticks - holdTime;
		var sizeMultiplier = Math.max(1, 1 + Math.abs(Math.sin(holdDuration / 60)) * 3);
		if (currentBullet.scale.x < sizeMultiplier) {
			currentBullet.scale.x = sizeMultiplier;
			currentBullet.scale.y = sizeMultiplier;
			if (currentBullet.bulletGraphics.width * currentBullet.scale.x > 150) {
				currentBullet.bulletGraphics.tint = 0xFFA500;
			}
		}
		currentBullet.flicker = true;
		var flickerAmount = Math.abs(Math.sin(LK.ticks / 30)) * (currentBullet.flickerMaxAlpha - currentBullet.flickerMinAlpha);
		currentBullet.alpha = currentBullet.flickerMinAlpha + flickerAmount;
		if (currentBullet.flicker) {
			currentBullet.alpha += currentBullet.flickerSpeed;
			if (currentBullet.alpha <= currentBullet.flickerMinAlpha || currentBullet.alpha >= currentBullet.flickerMaxAlpha) {
				currentBullet.flickerSpeed *= -1;
			}
			currentBullet.alpha = Math.max(currentBullet.flickerMinAlpha, Math.min(currentBullet.alpha, currentBullet.flickerMaxAlpha));
		}
		currentBullet.rotation = hero.rotation;
		currentBullet.x = hero.x;
		currentBullet.y = hero.y - hero.height / 2 - currentBullet.height / 2 - 10;
		currentBullet.flickerSpeed = 0.1;
		currentBullet.flickerMinAlpha = 0.3;
		currentBullet.flickerMaxAlpha = 1;
	}
});
var currentBullet = null;
var holdTime = 0;
var hero;
hero = game.addChild(new Hero());
hero.rotation = -Math.PI / 2;
var touchActive = false;
game.on('down', function (x, y, obj) {
	if (!touchActive) {
		touchActive = true;
		var pos = game.toLocal(obj.global);
		var dx = pos.x - hero.x;
		var dy = pos.y - hero.y;
		var angle = Math.atan2(dy, dx);
		hero.rotation = angle;
		currentBullet = new HeroBullet(hero);
		currentBullet.x = hero.x;
		currentBullet.y = hero.y - hero.height / 2 - currentBullet.height / 2 - 10;
		currentBullet.rotation = hero.rotation;
		game.addChild(currentBullet);
		if (game.scale.x > 2 && game.scale.y > 2) {
			bulletGraphics.tint = 0xFFA500;
		}
		holdTime = LK.ticks;
	}
});
game.on('up', function (x, y, obj) {
	touchActive = false;
});
game.on('move', function (x, y, obj) {
	var pos = game.toLocal(obj.global);
	var dx = pos.x - hero.x;
	var dy = pos.y - hero.y;
	var angle = Math.atan2(dy, dx);
	hero.rotation = angle;
});
var enemies = [];
var heroBullets = [];
var enemyBullets = [];
var clouds = [];
var particles = [];
for (var i = 0; i < 2; i++) {
	var cloud = new Cloud();
	cloud.alpha = 0.3;
	cloud.x = Math.random() * 2048;
	cloud.y = Math.random() * -2732;
	clouds.push(cloud);
	game.addChildAt(cloud, 1);
}
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff",
	dropShadow: true,
	dropShadowColor: "#000000",
	dropShadowBlur: 4,
	dropShadowAngle: Math.PI / 6,
	dropShadowDistance: 6
});
LK.gui.top.addChild(scoreTxt);
var isGameOver = false;
hero.x = 2048 / 2;
hero.y = 2732 - 280;
LK.setTimeout(function () {
	var startPosition = hero.y;
	var endPosition = startPosition - 500;
	var duration = 120;
	var step = (startPosition - endPosition) / duration;
	var currentStep = 0;
	var moveHero = function moveHero() {
		if (currentStep < duration) {
			hero.y -= step;
			currentStep++;
		} else if (currentStep < duration * 2) {
			hero.y += step;
			currentStep++;
		} else {
			hero.y = startPosition;
			LK.clearInterval(heroMoveInterval);
		}
	};
	var heroMoveInterval = LK.setInterval(moveHero, 1000 / 60);
}, 0);
LK.on('tick', function () {
	for (var i = 0; i < heroBullets.length; i++) {
		if (heroBullets[i]) {
			heroBullets[i]._move_migrated();
		}
		for (var j = 0; j < enemies.length; j++) {
			if (heroBullets[i] && heroBullets[i].intersects(enemies[j])) {
				enemies[j].life -= heroBullets[i].damage * 10;
				if (enemies[j].life <= 0) {
					var scoreIncrement = enemies[j] instanceof EnemyBoss ? 50 : 10;
					scoreIncrement += Math.floor(LK.ticks / 3600);
					LK.setScore(LK.getScore() + scoreIncrement);
					scoreTxt.setText(LK.getScore().toString());
					// Add explosion effect
					var explosion = new Explosion(enemies[j].x, enemies[j].y);
					game.addChild(explosion);
					LK.getSound('explosion').play();
					enemies[j].destroy();
					enemies.splice(j, 1);
				}
				heroBullets[i].destroy();
				heroBullets.splice(i, 1);
				break;
			}
		}
		if (heroBullets[i] && heroBullets[i].y < -50) {
			heroBullets[i].destroy();
			heroBullets.splice(i, 1);
			i--;
			i--;
		}
	}
	for (var i = 0; i < enemyBullets.length; i++) {
		enemyBullets[i]._move_migrated();
		if (enemyBullets[i].y > 2732 + 50) {
			enemyBullets[i].destroy();
			enemyBullets.splice(i, 1);
		}
	}
	for (var i = 0; i < enemies.length; i++) {
		if (enemies[i].intersects(hero)) {
			isGameOver = true;
			break;
		}
	}
	for (var i = 0; i < enemies.length; i++) {
		enemies[i]._move_migrated();
		if (enemies[i].y > 2732) {
			enemies[i].destroy();
			enemies.splice(i, 1);
			i--;
		}
	}
	clouds.forEach(function (cloud) {
		cloud._move_migrated();
	});
	if (isGameOver) {
		LK.effects.flashScreen(0xff0000, 1000);
		LK.showGameOver();
	}
});

===================================================================
--- original.js
+++ change.js
@@ -287,8 +287,9 @@
 		game.spawnEnemy();
 	}
 });
 game.on('up', function (x, y, obj) {
+	LK.getSound('ha').play();
 	if (currentBullet) {
 		var pos = game.toLocal(obj.global);
 		var dx = pos.x - hero.x;
 		var dy = pos.y - hero.y;