/**** 
* Classes
****/ 
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732 + enemyGraphics.height) {
			self.destroy();
			enemies.splice(enemies.indexOf(self), 1);
		}
	};
});
//<Assets used in the game will automatically appear here>
// FighterJet class
var FighterJet = Container.expand(function () {
	var self = Container.call(this);
	var jetGraphics = self.attachAsset('fighterJet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// Update logic for the fighter jet
	};
	self.shoot = function () {
		var bullet = new HeroBullet();
		bullet.x = self.x;
		bullet.y = self.y - jetGraphics.height / 2;
		game.addChild(bullet);
		heroBullets.push(bullet);
	};
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('heroBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15;
	self.update = function () {
		self.y += self.speed;
		if (self.y < -bulletGraphics.height) {
			self.destroy();
			heroBullets.splice(heroBullets.indexOf(self), 1);
		}
	};
});

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

/**** 
* Game Code
****/ 
function levelUp() {
	// Clear existing enemies and bullets
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].destroy();
		enemies.splice(i, 1);
	}
	for (var j = heroBullets.length - 1; j >= 0; j--) {
		heroBullets[j].destroy();
		heroBullets.splice(j, 1);
	}
	// Increase difficulty or change game state for new level
	// For example, increase enemy speed or spawn rate
	Enemy.prototype.speed += 2;
	// Reset score for new level
	score = 0;
	scoreTxt.setText(score);
}
// Initialize variables
var fighterJet;
var heroBullets = [];
var enemies = [];
var score = 0;
var scoreTxt;
// Initialize game elements
function initGame() {
	// Create fighter jet
	fighterJet = new FighterJet();
	fighterJet.x = 2048 / 2;
	fighterJet.y = 2732 - 200;
	game.addChild(fighterJet);
	// Create score text
	scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(0.5, 0);
	LK.gui.top.addChild(scoreTxt);
	// Spawn enemies at intervals
	LK.setInterval(spawnEnemy, 1000);
}
// Spawn enemy function
function spawnEnemy() {
	var enemy = new Enemy();
	enemy.x = Math.random() * 2048;
	enemy.y = -enemy.height;
	game.addChild(enemy);
	enemies.push(enemy);
}
// Update game state
game.update = function () {
	// Update fighter jet
	fighterJet.update();
	// Update hero bullets
	for (var i = heroBullets.length - 1; i >= 0; i--) {
		heroBullets[i].update();
	}
	// Update enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		enemies[j].update();
		// Check for collision with fighter jet
		if (fighterJet.intersects(enemies[j])) {
			// Flash screen red for 1 second (1000ms) to show we are dead.
			LK.effects.flashScreen(0xff0000, 1000);
			// Show game over. The game will be automatically paused while game over is showing.
			LK.showGameOver(); // Calling this will destroy the 'Game' and reset entire game state.
			return;
		}
		// Check for collision with hero bullets
		for (var k = heroBullets.length - 1; k >= 0; k--) {
			if (enemies[j].intersects(heroBullets[k])) {
				enemies[j].destroy();
				heroBullets[k].destroy();
				enemies.splice(j, 1);
				heroBullets.splice(k, 1);
				score++;
				scoreTxt.setText(score);
				if (score >= 10) {
					levelUp();
				}
				break;
			}
		}
	}
};
// Handle touch events
game.down = function (x, y, obj) {
	fighterJet.shoot();
};
game.move = function (x, y, obj) {
	fighterJet.x = x;
	fighterJet.y = y;
};
game.up = function (x, y, obj) {
	// No action needed on touch up
};
// Initialize game
initGame();

===================================================================
--- original.js
+++ change.js
@@ -139,9 +139,9 @@
 				enemies.splice(j, 1);
 				heroBullets.splice(k, 1);
 				score++;
 				scoreTxt.setText(score);
-				if (score >= 20) {
+				if (score >= 10) {
 					levelUp();
 				}
 				break;
 			}