===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,338 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Asteroid
+var Asteroid = Container.expand(function () {
+	var self = Container.call(this);
+	var rock = self.attachAsset('asteroid', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 10 + Math.random() * 6;
+	self.rotationSpeed = (Math.random() - 0.5) * 0.1;
+	self.update = function () {
+		self.y += self.speed;
+		rock.rotation += self.rotationSpeed;
+	};
+	return self;
+});
+// Enemy bullet
+var EnemyBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bullet = self.attachAsset('enemyBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 18;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Enemy ship
+var EnemyShip = Container.expand(function () {
+	var self = Container.call(this);
+	var enemy = self.attachAsset('enemyShip', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 6 + Math.random() * 4;
+	self.shootCooldown = 60 + Math.floor(Math.random() * 60);
+	self.radius = enemy.width * 0.5;
+	self.update = function () {
+		self.y += self.speed;
+		self.shootCooldown--;
+	};
+	return self;
+});
+// Player bullet
+var PlayerBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bullet = self.attachAsset('playerBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -32;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Powerup
+var Powerup = Container.expand(function () {
+	var self = Container.call(this);
+	var p = self.attachAsset('powerup', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 8;
+	self.type = 'invincible';
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Player spaceship
+var Spaceship = Container.expand(function () {
+	var self = Container.call(this);
+	var ship = self.attachAsset('spaceship', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = ship.width * 0.5;
+	self.invincible = false;
+	self.invincibleTimer = 0;
+	self.update = function () {
+		if (self.invincible) {
+			self.invincibleTimer--;
+			if (self.invincibleTimer <= 0) {
+				self.invincible = false;
+				ship.alpha = 1;
+			} else {
+				ship.alpha = LK.ticks % 10 < 5 ? 0.5 : 1;
+			}
+		}
+	};
+	self.makeInvincible = function (duration) {
+		self.invincible = true;
+		self.invincibleTimer = duration;
+		ship.alpha = 0.5;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x000010
+});
+
+/**** 
+* Game Code
+****/ 
+// Powerup
+// Asteroid
+// Enemy bullet
+// Enemy ship
+// Player bullet
+// Spaceship (player)
+// Game variables
+var player;
+var playerBullets = [];
+var enemies = [];
+var enemyBullets = [];
+var asteroids = [];
+var powerups = [];
+var dragNode = null;
+var lastPlayerX = 0,
+	lastPlayerY = 0;
+var canShoot = true;
+var shootCooldown = 0;
+var score = 0;
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+function spawnPlayer() {
+	player = new Spaceship();
+	player.x = 2048 / 2;
+	player.y = 2732 - 350;
+	game.addChild(player);
+}
+function spawnEnemy() {
+	var enemy = new EnemyShip();
+	enemy.x = 200 + Math.random() * (2048 - 400);
+	enemy.y = -100;
+	enemies.push(enemy);
+	game.addChild(enemy);
+}
+function spawnAsteroid() {
+	var asteroid = new Asteroid();
+	asteroid.x = 150 + Math.random() * (2048 - 300);
+	asteroid.y = -100;
+	asteroids.push(asteroid);
+	game.addChild(asteroid);
+}
+function spawnPowerup() {
+	var powerup = new Powerup();
+	powerup.x = 200 + Math.random() * (2048 - 400);
+	powerup.y = -80;
+	powerups.push(powerup);
+	game.addChild(powerup);
+}
+function firePlayerBullet() {
+	if (!player || player.invincible) return;
+	var bullet = new PlayerBullet();
+	bullet.x = player.x;
+	bullet.y = player.y - player.radius;
+	playerBullets.push(bullet);
+	game.addChild(bullet);
+}
+function fireEnemyBullet(enemy) {
+	var bullet = new EnemyBullet();
+	bullet.x = enemy.x;
+	bullet.y = enemy.y + enemy.radius;
+	enemyBullets.push(bullet);
+	game.addChild(bullet);
+}
+function resetGame() {
+	// Not needed, handled by LK.showGameOver
+}
+// Dragging and shooting
+game.down = function (x, y, obj) {
+	if (!player) return;
+	dragNode = player;
+	lastPlayerX = x;
+	lastPlayerY = y;
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+function handleMove(x, y, obj) {
+	if (dragNode === player) {
+		// Clamp to game area, avoid top 100px (menu)
+		var minX = player.radius + 20;
+		var maxX = 2048 - player.radius - 20;
+		var minY = 120 + player.radius;
+		var maxY = 2732 - player.radius - 20;
+		player.x = Math.max(minX, Math.min(maxX, x));
+		player.y = Math.max(minY, Math.min(maxY, y));
+	}
+}
+game.move = handleMove;
+// Tap to shoot (on any area)
+game.tap = function (x, y, obj) {
+	if (canShoot && !player.invincible) {
+		firePlayerBullet();
+		canShoot = false;
+		shootCooldown = 10;
+	}
+};
+// Main update loop
+game.update = function () {
+	// Player shooting cooldown
+	if (!canShoot) {
+		shootCooldown--;
+		if (shootCooldown <= 0) {
+			canShoot = true;
+		}
+	}
+	// Update player
+	if (player) player.update();
+	// Update and remove player bullets
+	for (var i = playerBullets.length - 1; i >= 0; i--) {
+		var b = playerBullets[i];
+		b.update();
+		if (b.y < -80) {
+			b.destroy();
+			playerBullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with enemies
+		for (var j = enemies.length - 1; j >= 0; j--) {
+			var e = enemies[j];
+			if (b.intersects(e)) {
+				// Destroy both
+				b.destroy();
+				playerBullets.splice(i, 1);
+				e.destroy();
+				enemies.splice(j, 1);
+				score += 100;
+				scoreTxt.setText(score);
+				break;
+			}
+		}
+	}
+	// Update and remove enemies
+	for (var i = enemies.length - 1; i >= 0; i--) {
+		var e = enemies[i];
+		e.update();
+		if (e.y > 2732 + 100) {
+			e.destroy();
+			enemies.splice(i, 1);
+			continue;
+		}
+		// Enemy shooting
+		if (e.shootCooldown <= 0) {
+			fireEnemyBullet(e);
+			e.shootCooldown = 90 + Math.floor(Math.random() * 60);
+		}
+		// Collision with player
+		if (player && !player.invincible && e.intersects(player)) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Update and remove enemy bullets
+	for (var i = enemyBullets.length - 1; i >= 0; i--) {
+		var b = enemyBullets[i];
+		b.update();
+		if (b.y > 2732 + 80) {
+			b.destroy();
+			enemyBullets.splice(i, 1);
+			continue;
+		}
+		// Collision with player
+		if (player && !player.invincible && b.intersects(player)) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Update and remove asteroids
+	for (var i = asteroids.length - 1; i >= 0; i--) {
+		var a = asteroids[i];
+		a.update();
+		if (a.y > 2732 + 100) {
+			a.destroy();
+			asteroids.splice(i, 1);
+			continue;
+		}
+		// Collision with player
+		if (player && !player.invincible && a.intersects(player)) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Update and remove powerups
+	for (var i = powerups.length - 1; i >= 0; i--) {
+		var p = powerups[i];
+		p.update();
+		if (p.y > 2732 + 80) {
+			p.destroy();
+			powerups.splice(i, 1);
+			continue;
+		}
+		// Collision with player
+		if (player && p.intersects(player)) {
+			player.makeInvincible(120);
+			p.destroy();
+			powerups.splice(i, 1);
+			score += 250;
+			scoreTxt.setText(score);
+			continue;
+		}
+	}
+	// Spawning logic
+	if (LK.ticks % 60 === 0) {
+		spawnEnemy();
+	}
+	if (LK.ticks % 120 === 0) {
+		spawnAsteroid();
+	}
+	if (LK.ticks % 600 === 0) {
+		spawnPowerup();
+	}
+};
+// Start game
+spawnPlayer();
\ No newline at end of file