===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,234 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var EnemyBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('enemyBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 8;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+var EnemyJet = Container.expand(function () {
+	var self = Container.call(this);
+	var jetGraphics = self.attachAsset('enemyJet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	jetGraphics.rotation = Math.PI;
+	self.speed = 3;
+	self.health = 1;
+	self.lastShot = 0;
+	self.shootInterval = 90;
+	self.update = function () {
+		self.y += self.speed;
+		// Enemy shooting logic
+		self.lastShot++;
+		if (self.lastShot >= self.shootInterval && self.y > 100 && self.y < 2500) {
+			self.lastShot = 0;
+			var newBullet = new EnemyBullet();
+			newBullet.x = self.x;
+			newBullet.y = self.y + 40;
+			enemyBullets.push(newBullet);
+			game.addChild(newBullet);
+		}
+	};
+	return self;
+});
+var PlayerBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('playerBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -12;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+var PlayerJet = Container.expand(function () {
+	var self = Container.call(this);
+	var jetGraphics = self.attachAsset('playerJet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.health = 3;
+	self.lastShot = 0;
+	self.shootInterval = 15;
+	self.update = function () {
+		// Auto shooting
+		self.lastShot++;
+		if (self.lastShot >= self.shootInterval) {
+			self.lastShot = 0;
+			var newBullet = new PlayerBullet();
+			newBullet.x = self.x;
+			newBullet.y = self.y - 50;
+			playerBullets.push(newBullet);
+			game.addChild(newBullet);
+			LK.getSound('shoot').play();
+		}
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x1a237e
+});
+
+/**** 
+* Game Code
+****/ 
+var player = game.addChild(new PlayerJet());
+player.x = 1024;
+player.y = 2400;
+var enemies = [];
+var playerBullets = [];
+var enemyBullets = [];
+var enemySpawnTimer = 0;
+var waveLevel = 1;
+var dragNode = null;
+var scoreTxt = new Text2('Score: 0', {
+	size: 80,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+var healthTxt = new Text2('Health: 3', {
+	size: 60,
+	fill: 0xFF4444
+});
+healthTxt.anchor.set(1, 0);
+LK.gui.topRight.addChild(healthTxt);
+function spawnEnemy() {
+	var enemy = new EnemyJet();
+	enemy.x = Math.random() * 1800 + 124;
+	enemy.y = -100;
+	enemy.speed = 2 + Math.random() * 3 + waveLevel * 0.5;
+	enemy.shootInterval = Math.max(60, 120 - waveLevel * 5);
+	enemies.push(enemy);
+	game.addChild(enemy);
+}
+function handleMove(x, y, obj) {
+	if (dragNode) {
+		dragNode.x = Math.max(60, Math.min(1988, x));
+		dragNode.y = Math.max(100, Math.min(2632, y));
+	}
+}
+game.move = handleMove;
+game.down = function (x, y, obj) {
+	dragNode = player;
+	handleMove(x, y, obj);
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+game.update = function () {
+	// Spawn enemies
+	enemySpawnTimer++;
+	var spawnRate = Math.max(30, 90 - waveLevel * 5);
+	if (enemySpawnTimer >= spawnRate) {
+		enemySpawnTimer = 0;
+		spawnEnemy();
+		// Increase difficulty every 10 enemies spawned
+		if (LK.ticks % 600 === 0) {
+			waveLevel++;
+		}
+	}
+	// Update player bullets
+	for (var i = playerBullets.length - 1; i >= 0; i--) {
+		var bullet = playerBullets[i];
+		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
+		// Remove bullets that go off screen
+		if (bullet.y < -50) {
+			bullet.destroy();
+			playerBullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with enemies
+		var hitEnemy = false;
+		for (var j = enemies.length - 1; j >= 0; j--) {
+			var enemy = enemies[j];
+			if (bullet.intersects(enemy)) {
+				// Enemy hit
+				LK.setScore(LK.getScore() + 100);
+				scoreTxt.setText('Score: ' + LK.getScore());
+				LK.getSound('enemyHit').play();
+				// Remove enemy and bullet
+				enemy.destroy();
+				enemies.splice(j, 1);
+				bullet.destroy();
+				playerBullets.splice(i, 1);
+				hitEnemy = true;
+				break;
+			}
+		}
+		if (!hitEnemy) {
+			bullet.lastY = bullet.y;
+		}
+	}
+	// Update enemy bullets
+	for (var i = enemyBullets.length - 1; i >= 0; i--) {
+		var bullet = enemyBullets[i];
+		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
+		// Remove bullets that go off screen
+		if (bullet.y > 2800) {
+			bullet.destroy();
+			enemyBullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with player
+		if (bullet.intersects(player)) {
+			player.health--;
+			healthTxt.setText('Health: ' + player.health);
+			LK.getSound('explosion').play();
+			LK.effects.flashObject(player, 0xff0000, 500);
+			bullet.destroy();
+			enemyBullets.splice(i, 1);
+			if (player.health <= 0) {
+				LK.showGameOver();
+				return;
+			}
+			continue;
+		}
+		bullet.lastY = bullet.y;
+	}
+	// Update enemies
+	for (var i = enemies.length - 1; i >= 0; i--) {
+		var enemy = enemies[i];
+		if (enemy.lastY === undefined) enemy.lastY = enemy.y;
+		// Remove enemies that go off screen
+		if (enemy.y > 2800) {
+			enemy.destroy();
+			enemies.splice(i, 1);
+			continue;
+		}
+		// Check collision with player
+		if (enemy.intersects(player)) {
+			player.health--;
+			healthTxt.setText('Health: ' + player.health);
+			LK.getSound('explosion').play();
+			LK.effects.flashObject(player, 0xff0000, 500);
+			enemy.destroy();
+			enemies.splice(i, 1);
+			if (player.health <= 0) {
+				LK.showGameOver();
+				return;
+			}
+			continue;
+		}
+		enemy.lastY = enemy.y;
+	}
+};
\ No newline at end of file