/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityX = 0;
	self.velocityY = 0;
	self.damage = 25;
	self.update = function () {
		self.x += self.velocityX;
		self.y += self.velocityY;
		// Remove if off screen
		if (self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			var index = bullets.indexOf(self);
			if (index !== -1) {
				bullets.splice(index, 1);
			}
			self.destroy();
		}
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.value = 10;
	self.lastPlayerDistance = Infinity;
	// Start small and grow when spawned
	self.scaleX = 0.1;
	self.scaleY = 0.1;
	tween(self, {
		scaleX: 1.5,
		scaleY: 1.5
	}, {
		duration: 800,
		easing: tween.bounceOut
	});
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		// Collect coin if player is close
		if (self.lastPlayerDistance > 40 && distance <= 40) {
			player.coins += self.value;
			LK.getSound('coin').play();
			// Animate coin growing before collection
			tween(self, {
				scaleX: 2.5,
				scaleY: 2.5,
				alpha: 0
			}, {
				duration: 300,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					var index = coins.indexOf(self);
					if (index !== -1) {
						coins.splice(index, 1);
					}
					self.destroy();
				}
			});
		}
		self.lastPlayerDistance = distance;
	};
	return self;
});
// Game arrays
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 100;
	self.maxHealth = 100;
	self.speed = 5;
	self.damage = 25;
	self.armor = 0;
	self.coins = 0;
	self.shootCooldown = 0;
	self.update = function () {
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
	};
	self.takeDamage = function (damage) {
		var actualDamage = Math.max(1, damage - self.armor);
		self.health -= actualDamage;
		if (self.health <= 0) {
			self.health = 0;
			LK.showGameOver();
		}
	};
	self.shoot = function (targetX, targetY) {
		if (self.shootCooldown > 0) return;
		var bullet = new Bullet();
		bullet.x = self.x;
		bullet.y = self.y;
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		bullet.velocityX = dx / distance * 15;
		bullet.velocityY = dy / distance * 15;
		bullet.damage = self.damage;
		bullets.push(bullet);
		game.addChild(bullet);
		LK.getSound('shoot').play();
		self.shootCooldown = 10;
	};
	return self;
});
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 50;
	self.maxHealth = 50;
	self.speed = 2;
	self.damage = 20;
	self.coinValue = 10;
	self.lastPlayerDistance = Infinity;
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 5) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
		// Check collision with player
		if (self.lastPlayerDistance > 30 && distance <= 30) {
			player.takeDamage(self.damage);
			LK.getSound('hit').play();
		}
		self.lastPlayerDistance = distance;
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.die();
		}
	};
	self.die = function () {
		var coin = new Coin();
		coin.x = self.x;
		coin.y = self.y;
		coin.value = self.coinValue;
		coins.push(coin);
		game.addChild(coin);
		var index = zombies.indexOf(self);
		if (index !== -1) {
			zombies.splice(index, 1);
		}
		self.destroy();
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2a2a2a
});

/**** 
* Game Code
****/ 
// Game state
var gameStarted = false;
// Start menu elements
var titleText = new Text2('ZOMBIE SURVIVAL', {
	size: 80,
	fill: 0xFFFFFF
});
titleText.anchor.set(0.5, 0.5);
LK.gui.center.addChild(titleText);
titleText.y = -200;
var playButton = new Text2('TAP TO START', {
	size: 60,
	fill: 0x00FF00
});
playButton.anchor.set(0.5, 0.5);
LK.gui.center.addChild(playButton);
playButton.y = 100;
// Game arrays
var zombies = [];
var bullets = [];
var coins = [];
// Game variables
var waveNumber = 1;
var zombiesPerWave = 5;
var spawnTimer = 0;
var zombiesSpawned = 0;
// Player variable (will be created when game starts)
var player = null;
// UI Elements (will be created when game starts)
var healthText = null;
var coinsText = null;
var waveText = null;
function startGame() {
	gameStarted = true;
	// Hide start menu
	titleText.visible = false;
	playButton.visible = false;
	// Create player
	player = game.addChild(new Player());
	player.x = 1024;
	player.y = 1366;
	// Create UI Elements
	healthText = new Text2('Health: 100/100', {
		size: 40,
		fill: 0xFF0000
	});
	healthText.anchor.set(0, 0);
	LK.gui.topLeft.addChild(healthText);
	healthText.x = 120;
	healthText.y = 20;
	coinsText = new Text2('Coins: 0', {
		size: 40,
		fill: 0xFFD700
	});
	coinsText.anchor.set(0, 0);
	LK.gui.topRight.addChild(coinsText);
	coinsText.x = -200;
	coinsText.y = 20;
	waveText = new Text2('Wave: 1', {
		size: 40,
		fill: 0xFFFFFF
	});
	waveText.anchor.set(0.5, 0);
	LK.gui.top.addChild(waveText);
	waveText.y = 20;
}
// Touch controls
var touchStartX = 0;
var touchStartY = 0;
var isMoving = false;
game.down = function (x, y, obj) {
	if (!gameStarted) {
		startGame();
		return;
	}
	touchStartX = x;
	touchStartY = y;
	isMoving = true;
	// Auto-shoot at touch position
	if (player) {
		player.shoot(x, y);
	}
};
game.move = function (x, y, obj) {
	if (!gameStarted || !player) return;
	if (isMoving) {
		var dx = x - touchStartX;
		var dy = y - touchStartY;
		var newX = player.x + dx * 0.5;
		var newY = player.y + dy * 0.5;
		// Keep player within bounds
		player.x = Math.max(30, Math.min(2018, newX));
		player.y = Math.max(30, Math.min(2702, newY));
		touchStartX = x;
		touchStartY = y;
	}
};
game.up = function (x, y, obj) {
	if (!gameStarted) return;
	isMoving = false;
};
// Game update loop
game.update = function () {
	if (!gameStarted || !player) return;
	// Update UI
	if (healthText && coinsText && waveText) {
		healthText.setText('Health: ' + player.health + '/' + player.maxHealth);
		coinsText.setText('Coins: ' + player.coins);
		waveText.setText('Wave: ' + waveNumber);
	}
	// Spawn zombies
	if (zombiesSpawned < zombiesPerWave) {
		spawnTimer++;
		if (spawnTimer >= 60) {
			// Spawn every second
			spawnTimer = 0;
			spawnZombie();
			zombiesSpawned++;
		}
	} else if (zombies.length === 0) {
		// Start next wave
		waveNumber++;
		zombiesPerWave += 2;
		zombiesSpawned = 0;
	}
	// Check bullet-zombie collisions
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		var bulletHit = false;
		for (var j = zombies.length - 1; j >= 0; j--) {
			var zombie = zombies[j];
			if (bullet.intersects(zombie)) {
				zombie.takeDamage(bullet.damage);
				bullets.splice(i, 1);
				bullet.destroy();
				bulletHit = true;
				break;
			}
		}
	}
};
function spawnZombie() {
	var zombie = new Zombie();
	// Spawn at random edge of screen
	var side = Math.floor(Math.random() * 4);
	switch (side) {
		case 0:
			// Top
			zombie.x = Math.random() * 2048;
			zombie.y = -50;
			break;
		case 1:
			// Right
			zombie.x = 2098;
			zombie.y = Math.random() * 2732;
			break;
		case 2:
			// Bottom
			zombie.x = Math.random() * 2048;
			zombie.y = 2782;
			break;
		case 3:
			// Left
			zombie.x = -50;
			zombie.y = Math.random() * 2732;
			break;
	}
	zombie.health += (waveNumber - 1) * 10; // Increase health with waves
	zombie.maxHealth = zombie.health;
	zombie.coinValue += Math.floor((waveNumber - 1) * 2);
	zombies.push(zombie);
	game.addChild(zombie);
}

===================================================================
--- original.js
+++ change.js
@@ -1,5 +1,10 @@
 /**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
 * Classes
 ****/ 
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
@@ -31,21 +36,42 @@
 		anchorY: 0.5
 	});
 	self.value = 10;
 	self.lastPlayerDistance = Infinity;
+	// Start small and grow when spawned
+	self.scaleX = 0.1;
+	self.scaleY = 0.1;
+	tween(self, {
+		scaleX: 1.5,
+		scaleY: 1.5
+	}, {
+		duration: 800,
+		easing: tween.bounceOut
+	});
 	self.update = function () {
 		var dx = player.x - self.x;
 		var dy = player.y - self.y;
 		var distance = Math.sqrt(dx * dx + dy * dy);
 		// Collect coin if player is close
 		if (self.lastPlayerDistance > 40 && distance <= 40) {
 			player.coins += self.value;
 			LK.getSound('coin').play();
-			var index = coins.indexOf(self);
-			if (index !== -1) {
-				coins.splice(index, 1);
-			}
-			self.destroy();
+			// Animate coin growing before collection
+			tween(self, {
+				scaleX: 2.5,
+				scaleY: 2.5,
+				alpha: 0
+			}, {
+				duration: 300,
+				easing: tween.easeOut,
+				onFinish: function onFinish() {
+					var index = coins.indexOf(self);
+					if (index !== -1) {
+						coins.splice(index, 1);
+					}
+					self.destroy();
+				}
+			});
 		}
 		self.lastPlayerDistance = distance;
 	};
 	return self;