/**** 
* Classes
****/ 
// Bullet class: fired by player, moves right, destroys zombies
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletAsset = self.attachAsset('centerCircle', {
		anchorX: 0.5,
		anchorY: 0.5,
		shape: 'ellipse'
	});
	bulletAsset.width = 60;
	bulletAsset.height = 60;
	bulletAsset.tint = 0xffe066; // yellow
	self.speed = 32;
	self.lastX = self.x;
	self.update = function () {
		self.lastX = self.x;
		self.x += self.speed;
	};
	return self;
});
// Player class: the hero that can move and shoot
var Player = Container.expand(function () {
	var self = Container.call(this);
	// Attach player asset, centered
	var playerAsset = self.attachAsset('character', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = 400;
	self.y = 1366;
	self.speed = 18;
	self.lastY = self.y;
	self.lastX = self.x;
	// Move up/down/left/right
	self.moveTo = function (x, y) {
		self.x = x;
		self.y = y;
	};
	// Update method (not much needed for player)
	self.update = function () {
		self.lastY = self.y;
		self.lastX = self.x;
	};
	return self;
});
// Zombie class: moves left, dies on bullet hit
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieAsset = self.attachAsset('centerCircle', {
		anchorX: 0.5,
		anchorY: 0.5,
		shape: 'box'
	});
	zombieAsset.width = 120;
	zombieAsset.height = 120;
	zombieAsset.tint = 0x4caf50; // green
	self.speed = 6 + Math.random() * 4;
	self.lastX = self.x;
	self.lastY = self.y;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		self.x -= self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game constants
var zombieSpawnInterval = 60; // frames between zombies
var bulletCooldown = 12; // frames between shots
var playerMoveRadius = 1000; // how far player can move from left
// Game state
var player;
var zombies = [];
var bullets = [];
var score = 0;
var gameStarted = false;
var lastZombieTick = 0;
var lastBulletTick = 0;
// Add score text to GUI
var scoreText = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
// Start the game
function startGame() {
	// Reset state
	for (var i = 0; i < zombies.length; i++) {
		zombies[i].destroy();
	}
	zombies = [];
	for (var i = 0; i < bullets.length; i++) {
		bullets[i].destroy();
	}
	bullets = [];
	score = 0;
	scoreText.setText(score);
	zombiesEscaped = 0;
	gameStarted = true;
	lastZombieTick = LK.ticks;
	lastBulletTick = 0;
	// Create player
	if (player) player.destroy();
	player = new Player();
	player.x = 400;
	player.y = 1366;
	game.addChild(player);
}
// Handle tap: move player to tap and shoot
game.down = function (x, y, obj) {
	if (!gameStarted) {
		startGame();
		return;
	}
	// Move player to tap position (clamped to left half of screen)
	var px = Math.max(100, Math.min(x, playerMoveRadius));
	var py = Math.max(120, Math.min(y, 2732 - 120));
	player.moveTo(px, py);
	// Shoot bullet if cooldown allows
	if (LK.ticks - lastBulletTick > bulletCooldown) {
		var bullet = new Bullet();
		bullet.x = player.x + 80;
		bullet.y = player.y;
		bullets.push(bullet);
		game.addChild(bullet);
		lastBulletTick = LK.ticks;
	}
};
// Main update loop
game.update = function () {
	if (!gameStarted) return;
	// Update player
	if (player) player.update();
	// Spawn zombies
	if (LK.ticks - lastZombieTick > zombieSpawnInterval) {
		var zombie = new Zombie();
		zombie.x = 2048 + 80;
		zombie.y = 200 + Math.random() * (2732 - 400);
		zombies.push(zombie);
		game.addChild(zombie);
		lastZombieTick = LK.ticks;
	}
	// Track escaped zombies
	if (typeof zombiesEscaped === "undefined") {
		var zombiesEscaped = 0;
	}
	for (var i = zombies.length - 1; i >= 0; i--) {
		var zombie = zombies[i];
		zombie.update();
		// Remove if off screen
		if (zombie.x < -120) {
			zombie.destroy();
			zombies.splice(i, 1);
			zombiesEscaped++;
			// Game over if 10 zombies escape
			if (zombiesEscaped >= 10) {
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				gameStarted = false;
				return;
			}
			continue;
		}
		// Check collision with player
		if (player.intersects(zombie)) {
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			gameStarted = false;
			return;
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		bullet.update();
		// Remove if off screen
		if (bullet.x > 2048 + 120) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with zombies
		for (var j = zombies.length - 1; j >= 0; j--) {
			var zombie = zombies[j];
			if (bullet.intersects(zombie)) {
				// Kill zombie and bullet
				zombie.destroy();
				zombies.splice(j, 1);
				bullet.destroy();
				bullets.splice(i, 1);
				// Score
				score += 1;
				scoreText.setText(score);
				break;
			}
		}
	}
};
// Start in idle state
gameStarted = false;
scoreText.setText('0');

===================================================================
--- original.js
+++ change.js
@@ -108,8 +108,9 @@
 	}
 	bullets = [];
 	score = 0;
 	scoreText.setText(score);
+	zombiesEscaped = 0;
 	gameStarted = true;
 	lastZombieTick = LK.ticks;
 	lastBulletTick = 0;
 	// Create player
@@ -152,16 +153,27 @@
 		zombies.push(zombie);
 		game.addChild(zombie);
 		lastZombieTick = LK.ticks;
 	}
-	// Update zombies
+	// Track escaped zombies
+	if (typeof zombiesEscaped === "undefined") {
+		var zombiesEscaped = 0;
+	}
 	for (var i = zombies.length - 1; i >= 0; i--) {
 		var zombie = zombies[i];
 		zombie.update();
 		// Remove if off screen
 		if (zombie.x < -120) {
 			zombie.destroy();
 			zombies.splice(i, 1);
+			zombiesEscaped++;
+			// Game over if 10 zombies escape
+			if (zombiesEscaped >= 10) {
+				LK.effects.flashScreen(0xff0000, 800);
+				LK.showGameOver();
+				gameStarted = false;
+				return;
+			}
 			continue;
 		}
 		// Check collision with player
 		if (player.intersects(zombie)) {