===================================================================
--- 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 = 6;
+	self.lastY = 0;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+var EnemyShip = Container.expand(function () {
+	var self = Container.call(this);
+	var shipGraphics = self.attachAsset('enemyShip', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = 60;
+	self.height = 60;
+	self.shootTimer = 0;
+	self.shootInterval = 60;
+	self.speed = 2;
+	self.lastY = 0;
+	self.lastIntersecting = false;
+	self.update = function () {
+		self.y += self.speed;
+		self.shootTimer++;
+	};
+	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.lastY = 0;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+var PlayerShip = Container.expand(function () {
+	var self = Container.call(this);
+	var shipGraphics = self.attachAsset('playerShip', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = 80;
+	self.height = 80;
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x000011
+});
+
+/**** 
+* Game Code
+****/ 
+var playerShip = game.addChild(new PlayerShip());
+playerShip.x = 1024;
+playerShip.y = 2600;
+var playerBullets = [];
+var enemyShips = [];
+var enemyBullets = [];
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+var dragNode = null;
+var gameActive = true;
+var shootCounter = 0;
+var enemySpawnCounter = 0;
+var waveLevel = 1;
+function getEnemySpawnRate() {
+	var baseRate = 120;
+	var scoreBonus = Math.floor(LK.getScore() / 10);
+	return Math.max(40, baseRate - scoreBonus * 5);
+}
+function getEnemySpeed() {
+	var baseSpeed = 2;
+	var scoreBonus = Math.floor(LK.getScore() / 20);
+	return baseSpeed + scoreBonus * 0.2;
+}
+function getEnemyShootInterval() {
+	var baseInterval = 80;
+	var scoreBonus = Math.floor(LK.getScore() / 15);
+	return Math.max(30, baseInterval - scoreBonus * 3);
+}
+game.down = function (x, y, obj) {
+	dragNode = playerShip;
+	handleGameMove(x, y, obj);
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+function handleGameMove(x, y, obj) {
+	if (dragNode) {
+		dragNode.x = x;
+		dragNode.x = Math.max(40, Math.min(2048 - 40, dragNode.x));
+		dragNode.y = Math.max(2400, Math.min(2732 - 40, dragNode.y));
+	}
+}
+game.move = handleGameMove;
+game.update = function () {
+	if (!gameActive) return;
+	// Player shooting
+	shootCounter++;
+	if (shootCounter >= 15) {
+		var newBullet = new PlayerBullet();
+		newBullet.x = playerShip.x;
+		newBullet.y = playerShip.y;
+		newBullet.lastY = newBullet.y;
+		playerBullets.push(newBullet);
+		game.addChild(newBullet);
+		LK.getSound('shoot').play();
+		shootCounter = 0;
+	}
+	// Spawn enemies
+	enemySpawnCounter++;
+	var spawnRate = getEnemySpawnRate();
+	if (enemySpawnCounter >= spawnRate) {
+		var newEnemy = new EnemyShip();
+		newEnemy.x = Math.random() * (2048 - 120) + 60;
+		newEnemy.y = -30;
+		newEnemy.speed = getEnemySpeed();
+		newEnemy.shootInterval = getEnemyShootInterval();
+		enemyShips.push(newEnemy);
+		game.addChild(newEnemy);
+		enemySpawnCounter = 0;
+	}
+	// Update player bullets
+	for (var i = playerBullets.length - 1; i >= 0; i--) {
+		var bullet = playerBullets[i];
+		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
+		// Off-screen check
+		if (bullet.lastY >= 0 && bullet.y < 0) {
+			bullet.destroy();
+			playerBullets.splice(i, 1);
+			continue;
+		}
+		bullet.lastY = bullet.y;
+	}
+	// Update enemy bullets
+	for (var i = enemyBullets.length - 1; i >= 0; i--) {
+		var ebullet = enemyBullets[i];
+		if (ebullet.lastY === undefined) ebullet.lastY = ebullet.y;
+		// Off-screen check
+		if (ebullet.lastY <= 2732 && ebullet.y > 2732) {
+			ebullet.destroy();
+			enemyBullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with player
+		if (ebullet.intersects(playerShip)) {
+			LK.getSound('hit').play();
+			LK.effects.flashScreen(0xff0000, 500);
+			gameActive = false;
+			LK.showGameOver();
+			return;
+		}
+		ebullet.lastY = ebullet.y;
+	}
+	// Update enemies
+	for (var i = enemyShips.length - 1; i >= 0; i--) {
+		var enemy = enemyShips[i];
+		if (enemy.lastY === undefined) enemy.lastY = enemy.y;
+		if (enemy.lastIntersecting === undefined) enemy.lastIntersecting = false;
+		// Enemy shooting
+		enemy.shootTimer++;
+		if (enemy.shootTimer >= enemy.shootInterval) {
+			var newEBullet = new EnemyBullet();
+			newEBullet.x = enemy.x;
+			newEBullet.y = enemy.y;
+			newEBullet.lastY = newEBullet.y;
+			enemyBullets.push(newEBullet);
+			game.addChild(newEBullet);
+			enemy.shootTimer = 0;
+		}
+		// Off-screen check
+		if (enemy.lastY <= 2732 && enemy.y > 2732) {
+			enemy.destroy();
+			enemyShips.splice(i, 1);
+			continue;
+		}
+		// Check collision with player
+		var currentIntersecting = enemy.intersects(playerShip);
+		if (!enemy.lastIntersecting && currentIntersecting) {
+			LK.getSound('hit').play();
+			LK.effects.flashScreen(0xff0000, 500);
+			gameActive = false;
+			LK.showGameOver();
+			return;
+		}
+		// Check collision with player bullets
+		for (var j = playerBullets.length - 1; j >= 0; j--) {
+			var pbullet = playerBullets[j];
+			if (pbullet.intersects(enemy)) {
+				LK.getSound('explosion').play();
+				LK.setScore(LK.getScore() + 10);
+				scoreTxt.setText(LK.getScore());
+				pbullet.destroy();
+				playerBullets.splice(j, 1);
+				enemy.destroy();
+				enemyShips.splice(i, 1);
+				break;
+			}
+		}
+		if (i >= 0 && i < enemyShips.length) {
+			enemy.lastY = enemy.y;
+			enemy.lastIntersecting = currentIntersecting;
+		}
+	}
+};
+LK.playMusic('bgmusic', {
+	loop: true
 });
\ No newline at end of file