/**** 
* Classes
****/ 
// Define the BackgroundObject class
var BackgroundObject = Container.expand(function () {
	var self = Container.call(this);
	var bgObjectGraphics = self.attachAsset('bgObject', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = (Math.random() * 5 + 2) * 1.5; // Increase speed by 50% 
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = -50; // Reset position to top once it goes off screen
			self.x = Math.random() * 2048; // Randomize x position
		}
	};
});
// Define the Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15;
	self.update = function () {
		self.y += self.speed;
	};
});
// Define the Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var size = Math.random() * 100 + 100;
	var enemyGraphics = self.attachAsset('enemy', {
		width: size,
		height: size,
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.rotationSpeed = Math.random() * 0.1 - 0.05;
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
	};
});
var Enemy2 = Container.expand(function () {
	var self = Container.call(this);
	var size = Math.random() * 100 + 100;
	var enemyGraphics = self.attachAsset('enemy2', {
		width: size,
		height: size,
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.rotationSpeed = Math.random() * 0.1 - 0.05;
	self.hits = 0; // Track the number of hits
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
	};
});
// Define the FastEnemy class
var FastEnemy = Container.expand(function () {
	var self = Container.call(this);
	var size = Math.random() * 100 + 100;
	var enemyGraphics = self.attachAsset('enemy3', {
		width: size,
		height: size,
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 6.5; // 30% faster than regular enemies
	self.rotationSpeed = Math.random() * 0.1 - 0.05;
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
	};
});
var FireRateEnemy = Container.expand(function () {
	var self = Container.call(this);
	var size = Math.random() * 100 + 100;
	var enemyGraphics = self.attachAsset('enemy4', {
		width: size,
		height: size,
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.rotationSpeed = Math.random() * 0.1 - 0.05;
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
	};
});
var NewEnemy = Container.expand(function () {
	var self = Container.call(this);
	var size = Math.random() * 100 + 100;
	var enemyGraphics = self.attachAsset('enemy5', {
		width: size,
		height: size,
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.rotationSpeed = Math.random() * 0.1 - 0.05;
	self.hits = 0; // Track the number of hits
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
	};
});
var NewEnemy6 = Container.expand(function () {
	var self = Container.call(this);
	var size = Math.random() * 100 + 100;
	var enemyGraphics = self.attachAsset('enemy6', {
		width: size,
		height: size,
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.rotationSpeed = Math.random() * 0.1 - 0.05;
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
	};
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Define the Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// Player movement logic will be handled in game.down and game.move
		// Shooting logic
		if (LK.ticks - lastShot >= fireRate * 60) {
			var bullet = new Bullet();
			bullet.x = self.x;
			bullet.y = self.y;
			bullets.push(bullet);
			game.addChild(bullet);
			lastShot = LK.ticks;
		}
	};
});
// Define the Wall class
var Wall = Container.expand(function () {
	var self = Container.call(this);
	var wallGraphics = self.attachAsset('levelBar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		// Walls are static, no update logic needed
	};
});

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

/**** 
* Game Code
****/ 
// New enemy asset
// Play background music and loop it continuously
LK.playMusic('backmusic', {
	loop: true
});
// New enemy asset
// Initialize variables
var player;
var enemies = [];
var bullets = [];
var score = 0;
var lives = 10;
var level = 1;
var levelText;
var scoreText;
var livesText;
var enemySpeedMultiplier = 1;
var enemySpawnRate = 1000;
var enemySpawnTimer;
// Function to start a new level
function startLevel() {
	var gainedFeaturesText = 'LEVEL ' + level; // Initialize the text with the level number
	levelText.setText(gainedFeaturesText); // Set the level text
	levelText.setStyle({
		fontSize: 100
	}); // Reduce font size for gained features text 
	levelText.anchor.set(0.5, 0.5); // Center the text on the screen
	levelText.visible = true;
	fireRate *= 0.997; // Reduce fire rate by 0.3% when transitioning to a new level
	// Declare heartAsset in the correct scope
	var heartAsset;
	// Display a heart asset at the top center and add 2 lives
	if (level > 1) {
		heartAsset = LK.getAsset('powerUpRed', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 1024,
			y: 1100
		});
		game.addChild(heartAsset);
	}
	// Add 2 lives
	lives += 2;
	livesText.setText('Lives: ' + lives);
	// Remove the heart asset after a short duration
	LK.setTimeout(function () {
		if (heartAsset) {
			heartAsset.destroy();
		}
	}, 2000);
	// Increase enemy speed and spawn rate by 5% each level
	enemySpeedMultiplier = 1.04 * Math.pow(1.04, level - 1);
	enemySpawnRate *= 0.95;
	// Increase background object speed by 10% each level
	backgroundObjects.forEach(function (bgObject) {
		bgObject.speed *= 1.10;
	});
	LK.setTimeout(function () {
		levelText.visible = false;
		spawnEnemies();
	}, 4000);
}
// Function to spawn enemies
function spawnEnemies() {
	enemySpawnTimer = LK.setInterval(function () {
		var enemy;
		if (Math.random() < 0.1) {
			enemy = new FastEnemy();
			enemy.speed *= 1.5; // Increase speed by 50%
		} else if (Math.random() < 0.05) {
			// 5% chance to spawn the new FireRateEnemy
			enemy = new FireRateEnemy();
		} else if (Math.random() < 0.05) {
			// 5% chance to spawn NewEnemy6
			enemy = new NewEnemy6();
		} else if (level > 1 && Math.random() < 0.2) {
			// 20% chance to spawn the new enemy type after level 1
			// 20% chance to spawn the new enemy type after level 1
			enemy = new Enemy2();
		} else if (Math.random() < 0.15) {
			// 15% chance to spawn the new enemy type in all levels
			enemy = new NewEnemy();
		} else {
			enemy = new Enemy();
		}
		enemy.x = Math.random() * 2048;
		enemy.y = -50;
		enemy.speed *= enemySpeedMultiplier;
		enemies.push(enemy);
		game.addChild(enemy);
	}, enemySpawnRate);
}
// Function to update score and level
function updateScore(points) {
	score += points;
	scoreText.setText('Score: ' + score);
	if (score >= 2500 * Math.pow(2.5, level - 1)) {
		level++;
		// Increase enemy speed and spawn rate by 10% each level
		enemySpeedMultiplier *= 1.1;
		enemySpawnRate *= 0.9;
		clearEnemies();
		startLevel();
	}
}
// Function to clear enemies
function clearEnemies() {
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].destroy();
	}
	enemies = [];
	LK.clearInterval(enemySpawnTimer);
}
// Initialize background objects
var backgroundObjects = [];
for (var i = 0; i < 40; i++) {
	// Create 40 background objects 
	// Create 20 background objects
	var bgObject = new BackgroundObject();
	bgObject.x = Math.random() * 2048;
	bgObject.y = Math.random() * 2732;
	backgroundObjects.push(bgObject);
	game.addChild(bgObject);
}
// Initialize player
player = new Player();
player.x = 1024;
player.y = 2500;
game.addChild(player);
// Initialize texts
levelText = new Text2('LEVEL 1', {
	size: 150,
	fill: 0xFFFFFF
});
levelText.anchor.set(0.5, 0.5);
LK.gui.center.addChild(levelText);
scoreText = new Text2('Score: 0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0, 0);
LK.gui.topLeft.addChild(scoreText);
// Display current fire rate below the score
var fireRateText = new Text2('Fire Rate: ' + (1 / fireRate).toFixed(2), {
	size: 80,
	fill: 0xFFFFFF
});
fireRateText.anchor.set(0, 0);
fireRateText.y = scoreText.height + 10; // Position below the score
LK.gui.topLeft.addChild(fireRateText);
livesText = new Text2('Lives: 10', {
	size: 100,
	fill: 0xFFFFFF
});
livesText.anchor.set(1, 0);
LK.gui.topRight.addChild(livesText);
// Start the first level
startLevel();
// Handle player movement
game.down = function (x, y, obj) {
	player.x = x;
};
game.move = function (x, y, obj) {
	var deltaX = x - player.x;
	// Prevent player from moving through walls
	if (x > 100 && x < 1948) {
		player.x = x;
	}
	backgroundObjects.forEach(function (bgObject) {
		bgObject.x -= deltaX * 0.1; // Move background objects in the opposite direction
	});
};
// Handle shooting
var lastShot = 0;
var fireRate = 0.5;
game.up = function (x, y, obj) {
	if (LK.ticks - lastShot >= fireRate * 60) {
		var bullet = new Bullet();
		bullet.x = player.x;
		bullet.y = player.y;
		bullets.push(bullet);
		game.addChild(bullet);
		lastShot = LK.ticks;
	}
};
// Game update loop
game.update = function () {
	// Update background objects
	for (var i = 0; i < backgroundObjects.length; i++) {
		backgroundObjects[i].update();
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].update();
		if (bullets[i].y < -50) {
			bullets[i].destroy();
			bullets.splice(i, 1);
		}
	}
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].update();
		// Prevent enemies from moving through walls
		if (enemies[i].x < 100) {
			enemies[i].x = 100;
		} else if (enemies[i].x > 1948) {
			enemies[i].x = 1948;
		}
		if (enemies[i].y > 2732) {
			if (!(enemies[i] instanceof FastEnemy) && !(enemies[i] instanceof FireRateEnemy)) {
				lives--;
				livesText.setText('Lives: ' + lives);
				if (lives <= 0) {
					LK.showGameOver();
				}
			}
			enemies[i].destroy();
			enemies.splice(i, 1);
		}
	}
	// Check for collisions
	for (var i = bullets.length - 1; i >= 0; i--) {
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (bullets[i].intersects(enemies[j])) {
				bullets[i].destroy();
				bullets.splice(i, 1);
				// Add explosion effect
				// Placeholder function as LK.effects.explosion does not exist
				var explosion = function explosion(x, y, scale, speed, rotationSpeed) {
					var explosionAsset = LK.getAsset('explosion', {
						anchorX: 0.5,
						anchorY: 0.5,
						x: x,
						y: y,
						scaleX: scale,
						scaleY: scale
					});
					explosionAsset.speed = speed;
					explosionAsset.rotationSpeed = rotationSpeed;
					explosionAsset.update = function () {
						this.y += this.speed;
						this.rotation += this.rotationSpeed;
						// Gradually shrink the explosion effect
						this.scaleX *= 0.95;
						this.scaleY *= 0.95;
						// If the explosion effect has shrunk to less than 5% of its original size, destroy it
						if (this.scaleX < 0.05 || this.scaleY < 0.05) {
							this.destroy();
						}
					};
					game.addChild(explosionAsset);
				};
				explosion(enemies[j].x, enemies[j].y, 1, enemies[j].speed, enemies[j].rotationSpeed);
				if (enemies[j] instanceof Enemy2) {
					enemies[j].hits++;
					if (enemies[j].hits >= 2) {
						enemies[j].destroy();
						enemies.splice(j, 1);
						updateScore(100); // Higher score for the tougher enemy
					}
				} else if (enemies[j] instanceof NewEnemy) {
					enemies[j].hits++;
					if (enemies[j].hits >= 2) {
						enemies[j].destroy();
						enemies.splice(j, 1);
						updateScore(200); // Score for NewEnemy
					}
				} else if (enemies[j] instanceof FastEnemy) {
					enemies[j].destroy();
					enemies.splice(j, 1);
					updateScore(150); // Higher score for the faster enemy
					// Slow down other enemies by 30%
					enemies.forEach(function (enemy) {
						enemy.speed *= 0.7;
					});
				} else if (enemies[j] instanceof FireRateEnemy) {
					enemies[j].destroy();
					enemies.splice(j, 1);
					updateScore(75); // Score for the FireRateEnemy
					fireRate *= 0.98; // Increase fire rate by 2%
				} else if (enemies[j] instanceof NewEnemy6) {
					enemies[j].destroy();
					enemies.splice(j, 1);
					updateScore(100); // Score for NewEnemy6
					var originalFireRate = fireRate;
					fireRate /= 2; // Double the fire rate
					LK.setTimeout(function () {
						fireRate = originalFireRate; // Revert to original fire rate after 3 seconds
					}, 3000);
				} else {
					enemies[j].destroy();
					enemies.splice(j, 1);
					updateScore(50);
				}
				break;
			}
		}
	}
	// Update fire rate text
	fireRateText.setText('Fire Rate: ' + (1 / fireRate).toFixed(2));
};

===================================================================
--- original.js
+++ change.js
@@ -219,9 +219,11 @@
 	lives += 2;
 	livesText.setText('Lives: ' + lives);
 	// Remove the heart asset after a short duration
 	LK.setTimeout(function () {
-		heartAsset.destroy();
+		if (heartAsset) {
+			heartAsset.destroy();
+		}
 	}, 2000);
 	// Increase enemy speed and spawn rate by 5% each level
 	enemySpeedMultiplier = 1.04 * Math.pow(1.04, level - 1);
 	enemySpawnRate *= 0.95;