/**** 
* Classes
****/ 
// Boss
var Boss = Container.expand(function () {
	var self = Container.call(this);
	var bossGraphics = self.attachAsset('boss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hitPoints = 10; // Boss takes 10 hits to be destroyed
	self.update = function () {
		if (LK.ticks % 60 == 0) {
			self.y += 40; // Boss moves slower than regular targets
		}
	};
});
// Assets will be automatically created and loaded by the LK engine based on usage in the game code.
// Player's Bullet
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		self.y -= self.speed;
		if (self.y < 0) {
			self.destroy();
		}
	};
});
// Target
var Target = Container.expand(function () {
	var self = Container.call(this);
	var targetGraphics = self.attachAsset('target', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hitPoints = 2; // Add hitPoints property
	self.update = function () {
		if (LK.ticks % 60 == 0) {
			self.y += 80;
		}
	};
});

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

/**** 
* Game Code
****/ 
var bullets = [];
var targets = [];
var score = 0;
// Create a target at a random position
function spawnTarget() {
	var target = new Target();
	target.x = Math.random() * 2048;
	target.y = 0;
	game.addChild(target);
	targets.push(target);
}
// Check for bullet collisions with targets
function checkCollisions() {
	bullets.forEach(function (bullet, bulletIndex) {
		targets.forEach(function (target, targetIndex) {
			if (bullet.intersects(target)) {
				bullet.destroy();
				bullets.splice(bulletIndex, 1);
				target.hitPoints -= 1; // Decrease target's hitPoints
				if (target.hitPoints <= 0) {
					target.destroy();
					targets.splice(targetIndex, 1);
					score += 1;
					if (target instanceof Boss) {
						score += 49; // Destroying a boss counts as 50 targets
					}
				}
				LK.effects.flashObject(target, 0xff0000, 500); // Flash target red on hit
			}
		});
	});
}
// Shoot a bullet from the bottom center of the screen
function shoot(x, y) {
	var bullet = new Bullet();
	bullet.x = x;
	bullet.y = 2732; // Start from the bottom of the screen
	game.addChild(bullet);
	bullets.push(bullet);
}
// Game update function
game.update = function () {
	if (LK.ticks % 30 == 0) {
		// Spawn a target every second
		spawnTarget();
		// Spawn a boss every 50 targets destroyed
		if (score % 50 == 0 && score > 0) {
			var boss = new Boss();
			boss.x = Math.random() * 2048;
			boss.y = 0;
			game.addChild(boss);
			targets.push(boss);
		}
	}
	checkCollisions();
	targets.forEach(function (target, targetIndex) {
		if (target.y >= 2732) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
};
// Touch event to shoot
game.down = function (x, y, obj) {
	shoot(x, y);
};
// Initialize a few targets
for (var i = 10; i < 10; i++) {
	spawnTarget();
}

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,21 @@
 /**** 
 * Classes
 ****/ 
+// Boss
+var Boss = Container.expand(function () {
+	var self = Container.call(this);
+	var bossGraphics = self.attachAsset('boss', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.hitPoints = 10; // Boss takes 10 hits to be destroyed
+	self.update = function () {
+		if (LK.ticks % 60 == 0) {
+			self.y += 40; // Boss moves slower than regular targets
+		}
+	};
+});
 // Assets will be automatically created and loaded by the LK engine based on usage in the game code.
 // Player's Bullet
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
@@ -64,8 +78,11 @@
 				if (target.hitPoints <= 0) {
 					target.destroy();
 					targets.splice(targetIndex, 1);
 					score += 1;
+					if (target instanceof Boss) {
+						score += 49; // Destroying a boss counts as 50 targets
+					}
 				}
 				LK.effects.flashObject(target, 0xff0000, 500); // Flash target red on hit
 			}
 		});
@@ -83,8 +100,16 @@
 game.update = function () {
 	if (LK.ticks % 30 == 0) {
 		// Spawn a target every second
 		spawnTarget();
+		// Spawn a boss every 50 targets destroyed
+		if (score % 50 == 0 && score > 0) {
+			var boss = new Boss();
+			boss.x = Math.random() * 2048;
+			boss.y = 0;
+			game.addChild(boss);
+			targets.push(boss);
+		}
 	}
 	checkCollisions();
 	targets.forEach(function (target, targetIndex) {
 		if (target.y >= 2732) {