/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	healthUpgrades: 0,
	ammoUpgrades: 0,
	speedUpgrades: 0,
	coins: 0
});

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.dx = 0;
	self.dy = 0;
	self.lifetime = 120;
	self.update = function () {
		self.x += self.dx * self.speed;
		self.y += self.dy * self.speed;
		// Rotate bullet to face movement direction
		graphics.rotation = Math.atan2(self.dy, self.dx);
		self.lifetime--;
		if (self.lifetime <= 0 || self.isOutOfBounds()) {
			self.remove();
			return;
		}
		for (var i = 0; i < zombies.length; i++) {
			var zombie = zombies[i];
			if (self.intersects(zombie)) {
				zombie.takeDamage(1);
				self.remove();
				return;
			}
		}
	};
	self.isOutOfBounds = function () {
		return self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732;
	};
	self.remove = function () {
		var index = bullets.indexOf(self);
		if (index > -1) {
			bullets.splice(index, 1);
		}
		self.destroy();
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 100;
	self.maxHealth = 100;
	self.ammo = 30;
	self.maxAmmo = 30;
	self.shootCooldown = 0;
	self.baseShootCooldown = 10;
	self.update = function () {
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			LK.effects.flashScreen(0xff0000, 1000);
			showCustomGameOver();
		} else {
			LK.effects.flashObject(self, 0xff0000, 200);
		}
	};
	self.canShoot = function () {
		return self.ammo > 0 && self.shootCooldown <= 0;
	};
	self.shoot = function () {
		if (self.canShoot()) {
			self.ammo--;
			self.shootCooldown = self.baseShootCooldown;
			return true;
		}
		return false;
	};
	return self;
});
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 1 + Math.random() * 0.5;
	self.health = 1;
	self.damage = 10;
	self.lastPlayerCollision = false;
	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 > 0) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
		var currentCollision = self.intersects(player);
		if (!self.lastPlayerCollision && currentCollision) {
			player.takeDamage(self.damage);
			// Zombie dies from collision but doesn't give coins
			self.health = 0;
			LK.effects.flashObject(self, 0xffffff, 100);
			LK.getSound('zombieHit').play();
			var index = zombies.indexOf(self);
			if (index > -1) {
				zombies.splice(index, 1);
			}
			self.destroy();
		}
		self.lastPlayerCollision = currentCollision;
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			LK.effects.flashObject(self, 0xffffff, 100);
			LK.setScore(LK.getScore() + 10);
			storage.coins += 10;
			LK.getSound('zombieHit').play();
			var index = zombies.indexOf(self);
			if (index > -1) {
				zombies.splice(index, 1);
			}
			self.destroy();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2d2d2d
});

/**** 
* Game Code
****/ 
var arena = game.attachAsset('arena', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 2732 / 2
});
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 / 2;
// Apply stored upgrades
player.maxHealth = 100 + storage.healthUpgrades * 20;
player.health = player.maxHealth;
player.maxAmmo = 30 + storage.ammoUpgrades * 10;
player.ammo = player.maxAmmo;
player.baseShootCooldown = Math.max(1, 10 - storage.speedUpgrades);
var zombies = [];
var bullets = [];
var waveNumber = 1;
var zombiesInWave = 5;
var zombiesSpawned = 0;
var spawnTimer = 0;
var gameOverScreen = null;
var showingGameOver = false;
var showingMarket = false;
var marketPanel = null;
var healthBar = new Text2('Health: 100', {
	size: 60,
	fill: 0xFF0000
});
healthBar.anchor.set(0, 0);
LK.gui.topLeft.addChild(healthBar);
var ammoDisplay = new Text2('Ammo: 30', {
	size: 60,
	fill: 0x00FF00
});
ammoDisplay.anchor.set(0, 0);
ammoDisplay.y = 70;
LK.gui.topLeft.addChild(ammoDisplay);
var scoreDisplay = new Text2('SCORE: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreDisplay.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreDisplay);
var coinDisplay = new Text2('COIN: ' + storage.coins, {
	size: 60,
	fill: 0xFFD700
});
coinDisplay.anchor.set(0.5, 0);
coinDisplay.y = 90;
LK.gui.top.addChild(coinDisplay);
var waveDisplay = new Text2('Wave: 1', {
	size: 60,
	fill: 0xFFFF00
});
waveDisplay.anchor.set(1, 0);
LK.gui.topRight.addChild(waveDisplay);
function showCustomGameOver() {
	if (showingGameOver) return;
	showingGameOver = true;
	gameOverScreen = new Container();
	// Semi-transparent background
	var background = LK.getAsset('arena', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2,
		scaleX: 3,
		scaleY: 3
	});
	background.alpha = 0.8;
	background.tint = 0x000000;
	gameOverScreen.addChild(background);
	// Game Over text
	var gameOverText = new Text2('GAME OVER', {
		size: 120,
		fill: 0xFF0000
	});
	gameOverText.anchor.set(0.5, 0.5);
	gameOverText.x = 2048 / 2;
	gameOverText.y = 2732 / 2 - 200;
	gameOverScreen.addChild(gameOverText);
	// Final score
	var finalScoreText = new Text2('Final SCORE: ' + LK.getScore(), {
		size: 80,
		fill: 0xFFFFFF
	});
	finalScoreText.anchor.set(0.5, 0.5);
	finalScoreText.x = 2048 / 2;
	finalScoreText.y = 2732 / 2 - 100;
	gameOverScreen.addChild(finalScoreText);
	// Market button
	var marketButton = LK.getAsset('marketButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2 + 50
	});
	gameOverScreen.addChild(marketButton);
	// Market button text
	var marketText = new Text2('MARKET', {
		size: 60,
		fill: 0xFFFFFF
	});
	marketText.anchor.set(0.5, 0.5);
	marketText.x = 2048 / 2;
	marketText.y = 2732 / 2 + 50;
	gameOverScreen.addChild(marketText);
	// Restart button
	var restartButton = LK.getAsset('marketButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2 + 150
	});
	restartButton.tint = 0x2196F3;
	gameOverScreen.addChild(restartButton);
	// Restart button text
	var restartText = new Text2('RESTART', {
		size: 60,
		fill: 0xFFFFFF
	});
	restartText.anchor.set(0.5, 0.5);
	restartText.x = 2048 / 2;
	restartText.y = 2732 / 2 + 150;
	gameOverScreen.addChild(restartText);
	game.addChild(gameOverScreen);
}
function hideGameOver() {
	if (gameOverScreen) {
		gameOverScreen.destroy();
		gameOverScreen = null;
	}
	showingGameOver = false;
}
function showMarket() {
	if (showingMarket) return;
	showingMarket = true;
	marketPanel = new Container();
	// Semi-transparent background
	var background = LK.getAsset('arena', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2,
		scaleX: 4,
		scaleY: 4
	});
	background.alpha = 0.9;
	background.tint = 0x000000;
	marketPanel.addChild(background);
	// Market title
	var marketTitle = new Text2('MARKET', {
		size: 140,
		fill: 0xFFFFFF
	});
	marketTitle.anchor.set(0.5, 0.5);
	marketTitle.x = 2048 / 2;
	marketTitle.y = 2732 / 2 - 400;
	marketPanel.addChild(marketTitle);
	// Show current coins
	var currentCoins = storage.coins;
	var scoreText = new Text2('COIN: ' + storage.coins, {
		size: 80,
		fill: 0xFFD700
	});
	scoreText.anchor.set(0.5, 0.5);
	scoreText.x = 2048 / 2;
	scoreText.y = 2732 / 2 - 300;
	marketPanel.addChild(scoreText);
	// Health upgrade
	var healthUpgrade = LK.getAsset('marketButton', {
		width: 600,
		height: 100,
		color: 0xFF6B6B,
		shape: 'box',
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2 - 150
	});
	healthUpgrade.down = function (x, y, obj) {
		if (storage.coins >= 100) {
			storage.coins -= 100;
			storage.healthUpgrades++;
			player.maxHealth += 20;
			player.health = Math.min(player.health + 20, player.maxHealth);
			coinDisplay.setText('COIN: ' + storage.coins);
			hideMarket();
			showMarket(); // Refresh market display
		}
	};
	marketPanel.addChild(healthUpgrade);
	var healthText = new Text2('Health +20 (100 COIN)', {
		size: 65,
		fill: 0xFFFFFF
	});
	healthText.anchor.set(0.5, 0.5);
	healthText.x = 2048 / 2 - 100;
	healthText.y = 2732 / 2 - 150;
	marketPanel.addChild(healthText);
	// Ammo upgrade
	var ammoUpgrade = LK.getAsset('marketButton', {
		width: 500,
		height: 100,
		color: 0x4ECDC4,
		shape: 'box',
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2 - 50
	});
	ammoUpgrade.down = function (x, y, obj) {
		if (storage.coins >= 50) {
			storage.coins -= 50;
			storage.ammoUpgrades++;
			player.maxAmmo += 10;
			player.ammo = Math.min(player.ammo + 10, player.maxAmmo);
			coinDisplay.setText('COIN: ' + storage.coins);
			hideMarket();
			showMarket(); // Refresh market display
		}
	};
	marketPanel.addChild(ammoUpgrade);
	var ammoText = new Text2('Ammo +10 (50 COIN)', {
		size: 65,
		fill: 0xFFFFFF
	});
	ammoText.anchor.set(0.5, 0.5);
	ammoText.x = 2048 / 2 - 100;
	ammoText.y = 2732 / 2 - 50;
	marketPanel.addChild(ammoText);
	// Speed upgrade
	var speedUpgrade = LK.getAsset('marketButton', {
		width: 550,
		height: 100,
		color: 0x45B7D1,
		shape: 'box',
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2 + 50
	});
	speedUpgrade.down = function (x, y, obj) {
		if (storage.coins >= 150) {
			storage.coins -= 150;
			storage.speedUpgrades++;
			player.baseShootCooldown = Math.max(1, player.baseShootCooldown - 1);
			coinDisplay.setText('COIN: ' + storage.coins);
			hideMarket();
			showMarket(); // Refresh market display
		}
	};
	marketPanel.addChild(speedUpgrade);
	var speedText = new Text2('Fire Rate +1 (150 COIN)', {
		size: 65,
		fill: 0xFFFFFF
	});
	speedText.anchor.set(0.5, 0.5);
	speedText.x = 2048 / 2 - 100;
	speedText.y = 2732 / 2 + 50;
	marketPanel.addChild(speedText);
	// Close button
	var closeButton = LK.getAsset('marketButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 2048 / 2,
		y: 2732 / 2 + 200
	});
	closeButton.tint = 0x666666;
	closeButton.down = function (x, y, obj) {
		hideMarket();
	};
	marketPanel.addChild(closeButton);
	var closeText = new Text2('CLOSE', {
		size: 80,
		fill: 0xFFFFFF
	});
	closeText.anchor.set(0.5, 0.5);
	closeText.x = 2048 / 2;
	closeText.y = 2732 / 2 + 200;
	marketPanel.addChild(closeText);
	game.addChild(marketPanel);
}
function hideMarket() {
	if (marketPanel) {
		marketPanel.destroy();
		marketPanel = null;
	}
	showingMarket = false;
}
function restartGame() {
	hideGameOver();
	// Reset player with upgraded stats
	player.maxHealth = 100 + storage.healthUpgrades * 20;
	player.health = player.maxHealth;
	player.maxAmmo = 30 + storage.ammoUpgrades * 10;
	player.ammo = player.maxAmmo;
	player.baseShootCooldown = Math.max(1, 10 - storage.speedUpgrades);
	player.x = 2048 / 2;
	player.y = 2732 / 2;
	// Clear all entities
	for (var i = 0; i < zombies.length; i++) {
		zombies[i].destroy();
	}
	zombies = [];
	for (var i = 0; i < bullets.length; i++) {
		bullets[i].destroy();
	}
	bullets = [];
	// Reset game state
	waveNumber = 1;
	zombiesInWave = 5;
	zombiesSpawned = 0;
	spawnTimer = 0;
	LK.setScore(0);
}
function spawnZombie() {
	var zombie = new Zombie();
	var angle = Math.random() * Math.PI * 2;
	var spawnRadius = 1000;
	zombie.x = player.x + Math.cos(angle) * spawnRadius;
	zombie.y = player.y + Math.sin(angle) * spawnRadius;
	zombies.push(zombie);
	game.addChild(zombie);
}
function shootBullet(targetX, targetY) {
	if (player.shoot()) {
		var bullet = new Bullet();
		bullet.x = player.x;
		bullet.y = player.y;
		var dx = targetX - player.x;
		var dy = targetY - player.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0) {
			bullet.dx = dx / distance;
			bullet.dy = dy / distance;
			// Rotate player to face shooting direction
			player.rotation = Math.atan2(dy, dx);
		}
		bullets.push(bullet);
		game.addChild(bullet);
		LK.getSound('shoot').play();
	}
}
game.down = function (x, y, obj) {
	if (showingGameOver) {
		// Market button click detection
		if (x >= 2048 / 2 - 150 && x <= 2048 / 2 + 150 && y >= 2732 / 2 + 10 && y <= 2732 / 2 + 90) {
			showMarket();
			return;
		}
		// Restart button click detection
		if (x >= 2048 / 2 - 150 && x <= 2048 / 2 + 150 && y >= 2732 / 2 + 110 && y <= 2732 / 2 + 190) {
			restartGame();
			return;
		}
	} else if (showingMarket) {
		var currentCoins = storage.coins;
		// Health upgrade button click
		if (x >= 2048 / 2 - 300 && x <= 2048 / 2 + 300 && y >= 2732 / 2 - 200 && y <= 2732 / 2 - 100) {
			if (storage.coins >= 100) {
				storage.coins -= 100;
				storage.healthUpgrades++;
				player.maxHealth += 20;
				player.health = Math.min(player.health + 20, player.maxHealth);
				coinDisplay.setText('COIN: ' + storage.coins);
				hideMarket();
				showMarket(); // Refresh market display
			}
			return;
		}
		// Ammo upgrade button click
		if (x >= 2048 / 2 - 250 && x <= 2048 / 2 + 250 && y >= 2732 / 2 - 100 && y <= 2732 / 2 + 0) {
			if (storage.coins >= 50) {
				storage.coins -= 50;
				storage.ammoUpgrades++;
				player.maxAmmo += 10;
				player.ammo = Math.min(player.ammo + 10, player.maxAmmo);
				coinDisplay.setText('COIN: ' + storage.coins);
				hideMarket();
				showMarket(); // Refresh market display
			}
			return;
		}
		// Speed upgrade button click
		if (x >= 2048 / 2 - 275 && x <= 2048 / 2 + 275 && y >= 2732 / 2 + 0 && y <= 2732 / 2 + 100) {
			if (storage.coins >= 150) {
				storage.coins -= 150;
				storage.speedUpgrades++;
				player.baseShootCooldown = Math.max(1, player.baseShootCooldown - 1);
				coinDisplay.setText('COIN: ' + storage.coins);
				hideMarket();
				showMarket(); // Refresh market display
			}
			return;
		}
		// Close button click
		if (x >= 2048 / 2 - 200 && x <= 2048 / 2 + 200 && y >= 2732 / 2 + 150 && y <= 2732 / 2 + 250) {
			hideMarket();
			return;
		}
	} else {
		shootBullet(x, y);
	}
};
game.update = function () {
	if (showingGameOver || showingMarket) {
		return;
	}
	spawnTimer++;
	if (zombiesSpawned < zombiesInWave && spawnTimer >= 60) {
		spawnZombie();
		zombiesSpawned++;
		spawnTimer = 0;
	}
	if (zombiesSpawned >= zombiesInWave && zombies.length === 0) {
		waveNumber++;
		zombiesInWave = Math.min(5 + waveNumber * 2, 20);
		zombiesSpawned = 0;
		waveDisplay.setText('Wave: ' + waveNumber);
		for (var i = 0; i < zombies.length; i++) {
			zombies[i].speed += 0.1;
		}
	}
	healthBar.setText('Health: ' + player.health);
	ammoDisplay.setText('Ammo: ' + player.ammo);
	scoreDisplay.setText('SCORE: ' + LK.getScore());
	coinDisplay.setText('COIN: ' + storage.coins);
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].update();
	}
	for (var i = zombies.length - 1; i >= 0; i--) {
		zombies[i].update();
	}
};
LK.playMusic('bgmusic');

===================================================================
--- original.js
+++ change.js
@@ -24,8 +24,10 @@
 	self.lifetime = 120;
 	self.update = function () {
 		self.x += self.dx * self.speed;
 		self.y += self.dy * self.speed;
+		// Rotate bullet to face movement direction
+		graphics.rotation = Math.atan2(self.dy, self.dx);
 		self.lifetime--;
 		if (self.lifetime <= 0 || self.isOutOfBounds()) {
 			self.remove();
 			return;