/**** 
* Classes
****/ 
// Asteroid class
var Asteroid = Container.expand(function () {
	var self = Container.call(this);
	var asteroidGraphics = self.attachAsset('asteroid', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 15;
	self.rotationSpeed = 0.02;
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});
// Boss class
var Boss = Container.expand(function () {
	var self = Container.call(this);
	var bossGraphics = self.attachAsset('boss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		rotation: 0.785398 // Rotate by 45 degrees to the right
	});
	self.speed = -30;
	self.update = function () {
		self.y += self.speed;
		if (self.y < 0) {
			self.destroy();
		}
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	enemyGraphics.rotation = -0.785398; // Rotate by 90 degrees to the left
	self.speed = 3;
	self.horizontalSpeed = Math.random() * 4 - 2; // Random speed between -2 and 2
	self.update = function () {
		self.y += self.speed;
		self.x += self.horizontalSpeed;
		if (self.x < 0) {
			self.x = 0;
			self.horizontalSpeed = Math.random() * 4 - 2; // Random speed between -2 and 2
		} else if (self.x > 2048) {
			self.x = 2048;
			self.horizontalSpeed = Math.random() * 4 - 2; // Random speed between -2 and 2
		}
		if (self.y > 2732) {
			self.destroy();
		}
		for (var i = 0; i < enemies.length; i++) {
			if (enemies[i] != self && enemies[i].intersects(self)) {
				self.horizontalSpeed = -self.horizontalSpeed;
				break;
			}
		}
		for (var i = 0; i < asteroids.length; i++) {
			if (asteroids[i].intersects(self)) {
				self.horizontalSpeed = -self.horizontalSpeed;
				break;
			}
		}
	};
});
// Explosion class
var Explosion = Container.expand(function () {
	var self = Container.call(this);
	var explosionGraphics = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		// Reduce the size of the explosion over time
		self.scale.x -= 0.01;
		self.scale.y -= 0.01;
		// Once the explosion has disappeared, destroy it
		if (self.scale.x <= 0 || self.scale.y <= 0) {
			self.destroy();
		}
	};
});
//<Assets used in the game will automatically appear here>
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.bulletLimit = 10; // Limit of bullets that can be fired before reloading
	self.bulletsFired = 0; // Number of bullets fired since last reload
	self.reloadTime = 180; // Time to reload in ticks (3 seconds)
	self.reloadCounter = 0; // Counter for reload time
	self.canShoot = true; // Whether the hero can shoot or not
	self.update = function () {
		// If the hero has fired the maximum number of bullets, start the reload counter
		if (self.bulletsFired >= self.bulletLimit) {
			self.canShoot = false;
			self.reloadCounter++;
			// If the reload time has passed, reset the counter and the number of bullets fired
			if (self.reloadCounter >= self.reloadTime) {
				self.bulletsFired = 0;
				self.reloadCounter = 0;
				self.canShoot = true;
				bulletCountTxt.setText('Bullets: ' + (self.bulletLimit - self.bulletsFired));
				reloadTxt.visible = false; // Hide the reload sign
			} else if (self.reloadCounter > 0) {
				reloadTxt.visible = true; // Show the reload sign
			}
		}
	};
});
// Star class
var Star = Container.expand(function () {
	var self = Container.call(this);
	var starGraphics = self.attachAsset('star', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set a random brightness for each star
	starGraphics.alpha = Math.random();
	self.speed = 30;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});

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

/**** 
* Game Code
****/ 
// Initialize hero
var hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2732 - 400;
// Create a Text2 object to display the number of bullets left before reloading
var bulletCountTxt = new Text2('Bullets: ' + (hero.bulletLimit - hero.bulletsFired), {
	size: 50,
	fill: "#ffffff"
});
bulletCountTxt.anchor.set(1, 1); // Anchor to the bottom right corner
LK.gui.bottomRight.addChild(bulletCountTxt);
// Create a Text2 object to display the score at the top of the screen
var scoreTxt = new Text2('Score: 0', {
	size: 100,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0); // Anchor to the top center
LK.gui.top.addChild(scoreTxt);
// Create a Text2 object to display the reload sign
var reloadTxt = new Text2('RELOADING...', {
	size: 100,
	fill: "#ff0000"
});
reloadTxt.anchor.set(0.5, 0.5); // Anchor to the center
reloadTxt.visible = false; // Initially hidden
LK.gui.center.addChild(reloadTxt);
// Initialize arrays for asteroids, enemies, bullets and stars
var asteroids = [];
var enemies = [];
var bullets = [];
var stars = [];
// Initialize a variable to keep track of the number of enemies in the current wave
var enemiesInWave = 0;
// Function to spawn stars
function spawnStar() {
	var star = new Star();
	star.x = Math.random() * 2048;
	star.y = -50;
	stars.push(star);
	game.addChild(star);
}
// Function to handle hero movement
function handleMove(x, y, obj) {
	hero.x = x;
}
// Function to shoot bullets
function shootBullet() {
	var bullet = new Bullet();
	bullet.x = hero.x;
	bullet.y = hero.y - 50;
	bullets.push(bullet);
	game.addChild(bullet);
}
// Function to spawn asteroids
function spawnAsteroid() {
	var asteroid = new Asteroid();
	asteroid.x = Math.random() * 2048;
	asteroid.y = -50;
	asteroids.push(asteroid);
	game.addChild(asteroid);
}
// Function to spawn enemies
function spawnEnemy() {
	// Only spawn a new wave of enemies if all enemies from the previous wave have been destroyed
	if (enemiesInWave == 0) {
		for (var i = 0; i < 3; i++) {
			var enemy = new Enemy();
			enemy.x = Math.random() * 2048;
			enemy.y = -50;
			enemies.push(enemy);
			game.addChild(enemy);
		}
		enemiesInWave = 3;
	}
}
// Handle game move event
game.move = handleMove;
// Handle game down event to shoot bullets
game.down = function (x, y, obj) {
	if (hero.canShoot) {
		shootBullet();
		hero.bulletsFired++;
		bulletCountTxt.setText('Bullets: ' + (hero.bulletLimit - hero.bulletsFired));
	}
};
// Update game logic
game.update = function () {
	// Update asteroids
	for (var i = asteroids.length - 1; i >= 0; i--) {
		asteroids[i].update();
		if (asteroids[i].intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			// Create an explosion at the point of collision
			var explosion = new Explosion();
			explosion.x = hero.x;
			explosion.y = hero.y;
			game.addChild(explosion);
			// Make the hero vanish off the screen
			hero.x = -1000;
			hero.y = -1000;
			LK.setTimeout(function () {
				LK.showGameOver();
			}, 3000);
		}
	}
	// Update enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		enemies[j].update();
		if (enemies[j].intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		} else if (enemies[j].y >= 2732) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Update bullets
	for (var k = bullets.length - 1; k >= 0; k--) {
		bullets[k].update();
		for (var l = enemies.length - 1; l >= 0; l--) {
			if (bullets[k].intersects(enemies[l])) {
				// Create a smaller explosion at the point of collision
				var smallExplosion = new Explosion();
				smallExplosion.x = bullets[k].x;
				smallExplosion.y = bullets[k].y;
				smallExplosion.scale.x = 0.5;
				smallExplosion.scale.y = 0.5;
				game.addChild(smallExplosion);
				bullets[k].destroy();
				enemies[l].destroy();
				bullets.splice(k, 1);
				enemies.splice(l, 1);
				// Decrease the number of enemies in the current wave
				enemiesInWave--;
				// Increase the score and update the score text
				LK.setScore(LK.getScore() + 1);
				scoreTxt.setText('Score: ' + LK.getScore());
				// Check if the score has hit 50
				if (LK.getScore() == 50) {
					// Remove all the asteroids and enemies
					for (var i = asteroids.length - 1; i >= 0; i--) {
						asteroids[i].destroy();
						asteroids.splice(i, 1);
					}
					for (var i = enemies.length - 1; i >= 0; i--) {
						enemies[i].destroy();
						enemies.splice(i, 1);
					}
					// Spawn a boss
					var boss = new Boss();
					boss.x = 2048 / 2;
					boss.y = -50;
					game.addChild(boss);
				}
				break;
			}
		}
	}
	// Update stars
	for (var m = stars.length - 1; m >= 0; m--) {
		stars[m].update();
		if (stars[m].y > 2732) {
			stars[m].destroy();
			stars.splice(m, 1);
		}
	}
	// Spawn asteroids, enemies and stars periodically
	if (LK.ticks % 30 == 0) {
		spawnAsteroid();
	}
	if (LK.ticks % 120 == 0) {
		spawnEnemy();
	}
	if (LK.ticks % 5 == 0) {
		spawnStar();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -17,8 +17,23 @@
 			self.destroy();
 		}
 	};
 });
+// Boss class
+var Boss = Container.expand(function () {
+	var self = Container.call(this);
+	var bossGraphics = self.attachAsset('boss', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 2;
+	self.update = function () {
+		self.y += self.speed;
+		if (self.y > 2732) {
+			self.destroy();
+		}
+	};
+});
 // Bullet class
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
 	var bulletGraphics = self.attachAsset('bullet', {
@@ -284,8 +299,25 @@
 				enemiesInWave--;
 				// Increase the score and update the score text
 				LK.setScore(LK.getScore() + 1);
 				scoreTxt.setText('Score: ' + LK.getScore());
+				// Check if the score has hit 50
+				if (LK.getScore() == 50) {
+					// Remove all the asteroids and enemies
+					for (var i = asteroids.length - 1; i >= 0; i--) {
+						asteroids[i].destroy();
+						asteroids.splice(i, 1);
+					}
+					for (var i = enemies.length - 1; i >= 0; i--) {
+						enemies[i].destroy();
+						enemies.splice(i, 1);
+					}
+					// Spawn a boss
+					var boss = new Boss();
+					boss.x = 2048 / 2;
+					boss.y = -50;
+					game.addChild(boss);
+				}
 				break;
 			}
 		}
 	}