===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,405 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+var storage = LK.import("@upit/storage.v1");
+
+/**** 
+* Classes
+****/ 
+// Alien
+var Alien = Container.expand(function () {
+	var self = Container.call(this);
+	var alien = self.attachAsset('alien', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = alien.width;
+	self.height = alien.height;
+	self.row = 0;
+	self.col = 0;
+	self.alive = true;
+	self.shootCooldown = 0;
+	self.update = function () {
+		// No per-alien update needed; movement handled by global logic
+	};
+	self.shoot = function () {
+		var bullet = new AlienBullet();
+		bullet.x = self.x;
+		bullet.y = self.y + self.height / 2 + bullet.height / 2;
+		alienBullets.push(bullet);
+		game.addChild(bullet);
+		LK.getSound('alienShoot').play();
+	};
+	self.hit = function () {
+		self.alive = false;
+		LK.getSound('explosion').play();
+		LK.effects.flashObject(self, 0xffffff, 200);
+		self.visible = false;
+	};
+	return self;
+});
+// Alien Bullet
+var AlienBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bullet = self.attachAsset('alienBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = bullet.width;
+	self.height = bullet.height;
+	self.speed = 18;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	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.width = bullet.width;
+	self.height = bullet.height;
+	self.speed = -32;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Player Ship
+var PlayerShip = Container.expand(function () {
+	var self = Container.call(this);
+	var ship = self.attachAsset('playerShip', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = ship.width;
+	self.height = ship.height;
+	self.canShoot = true;
+	self.shootCooldown = 18; // frames between shots
+	self.cooldownTimer = 0;
+	self.lives = 1;
+	self.invincible = false;
+	self.invincibleTimer = 0;
+	self.update = function () {
+		if (self.cooldownTimer > 0) self.cooldownTimer--;
+		if (self.invincible) {
+			self.invincibleTimer--;
+			if (self.invincibleTimer <= 0) {
+				self.invincible = false;
+				ship.alpha = 1;
+			} else {
+				ship.alpha = LK.ticks % 10 < 5 ? 0.4 : 1;
+			}
+		}
+	};
+	self.shoot = function () {
+		if (self.cooldownTimer === 0 && self.visible) {
+			self.cooldownTimer = self.shootCooldown;
+			var bullet = new PlayerBullet();
+			bullet.x = self.x;
+			bullet.y = self.y - self.height / 2 - bullet.height / 2;
+			playerBullets.push(bullet);
+			game.addChild(bullet);
+			LK.getSound('shoot').play();
+		}
+	};
+	self.hit = function () {
+		if (self.invincible) return;
+		self.lives--;
+		if (self.lives <= 0) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.getSound('explosion').play();
+			LK.showGameOver();
+		} else {
+			self.invincible = true;
+			self.invincibleTimer = 90;
+		}
+	};
+	self.applyPowerup = function () {
+		self.shootCooldown = 8;
+		LK.getSound('powerup').play();
+		LK.effects.flashObject(self, 0xaa66ff, 600);
+		LK.setTimeout(function () {
+			self.shootCooldown = 18;
+		}, 4000);
+	};
+	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.width = p.width;
+	self.height = p.height;
+	self.speed = 10;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
 	backgroundColor: 0x000000
-});
\ No newline at end of file
+});
+
+/**** 
+* Game Code
+****/ 
+// Music
+// Sound effects
+// Powerup: purple ellipse
+// Alien bullet: red ellipse
+// Alien: green box
+// Player bullet: yellow ellipse
+// Player ship: blue box
+// Play music
+LK.playMusic('spaceMusic');
+// Score
+var score = 0;
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: "#fff"
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Player
+var player = new PlayerShip();
+player.x = 2048 / 2;
+player.y = 2732 - 180;
+game.addChild(player);
+// Bullets and objects
+var playerBullets = [];
+var alienBullets = [];
+var aliens = [];
+var powerups = [];
+// Alien grid
+var alienRows = 5;
+var alienCols = 8;
+var alienSpacingX = 180;
+var alienSpacingY = 120;
+var alienStartX = (2048 - (alienCols - 1) * alienSpacingX) / 2;
+var alienStartY = 320;
+var alienDir = 1; // 1: right, -1: left
+var alienSpeed = 12; // px per move
+var alienMoveDown = 60; // px to move down when hitting edge
+var alienMoveTimer = 0;
+var alienMoveInterval = 32; // frames between moves, decreases as aliens die
+var alienShootChance = 0.012; // chance per alien per move to shoot
+function spawnAliens() {
+	aliens.length = 0;
+	for (var row = 0; row < alienRows; row++) {
+		for (var col = 0; col < alienCols; col++) {
+			var a = new Alien();
+			a.row = row;
+			a.col = col;
+			a.x = alienStartX + col * alienSpacingX;
+			a.y = alienStartY + row * alienSpacingY;
+			aliens.push(a);
+			game.addChild(a);
+		}
+	}
+}
+spawnAliens();
+// Powerup spawn
+var powerupTimer = 0;
+var powerupInterval = 600; // frames
+// Dragging
+var dragging = false;
+var dragOffsetX = 0;
+// Move handler
+function handleMove(x, y, obj) {
+	if (dragging) {
+		var newX = x - dragOffsetX;
+		// Clamp to screen
+		var minX = player.width / 2 + 20;
+		var maxX = 2048 - player.width / 2 - 20;
+		player.x = Math.max(minX, Math.min(maxX, newX));
+	}
+}
+game.move = handleMove;
+game.down = function (x, y, obj) {
+	// Only drag if touch is on player
+	var local = player.toLocal(game.toGlobal({
+		x: x,
+		y: y
+	}));
+	if (local.x > -player.width / 2 && local.x < player.width / 2 && local.y > -player.height / 2 && local.y < player.height / 2) {
+		dragging = true;
+		dragOffsetX = x - player.x;
+	}
+};
+game.up = function (x, y, obj) {
+	dragging = false;
+};
+// Tap to shoot
+game.tap = function (x, y, obj) {
+	player.shoot();
+};
+// For mobile: allow tap anywhere to shoot
+game.down = function (x, y, obj) {
+	// Drag if on player, else shoot
+	var local = player.toLocal(game.toGlobal({
+		x: x,
+		y: y
+	}));
+	if (local.x > -player.width / 2 && local.x < player.width / 2 && local.y > -player.height / 2 && local.y < player.height / 2) {
+		dragging = true;
+		dragOffsetX = x - player.x;
+	} else {
+		player.shoot();
+	}
+};
+// Main update loop
+game.update = function () {
+	// Player update
+	player.update();
+	// Player bullets
+	for (var i = playerBullets.length - 1; i >= 0; i--) {
+		var b = playerBullets[i];
+		b.update();
+		if (b.y < -b.height) {
+			b.destroy();
+			playerBullets.splice(i, 1);
+			continue;
+		}
+		// Collide with aliens
+		for (var j = 0; j < aliens.length; j++) {
+			var a = aliens[j];
+			if (a.alive && b.intersects(a)) {
+				a.hit();
+				b.destroy();
+				playerBullets.splice(i, 1);
+				score += 100;
+				scoreTxt.setText(score);
+				break;
+			}
+		}
+	}
+	// Alien bullets
+	for (var i = alienBullets.length - 1; i >= 0; i--) {
+		var b = alienBullets[i];
+		b.update();
+		if (b.y > 2732 + b.height) {
+			b.destroy();
+			alienBullets.splice(i, 1);
+			continue;
+		}
+		// Collide with player
+		if (b.intersects(player) && !player.invincible) {
+			b.destroy();
+			alienBullets.splice(i, 1);
+			player.hit();
+			break;
+		}
+	}
+	// Powerups
+	for (var i = powerups.length - 1; i >= 0; i--) {
+		var p = powerups[i];
+		p.update();
+		if (p.y > 2732 + p.height) {
+			p.destroy();
+			powerups.splice(i, 1);
+			continue;
+		}
+		if (p.intersects(player)) {
+			p.destroy();
+			powerups.splice(i, 1);
+			player.applyPowerup();
+			break;
+		}
+	}
+	// Aliens movement
+	alienMoveTimer++;
+	if (alienMoveTimer >= alienMoveInterval) {
+		alienMoveTimer = 0;
+		var minX = 99999,
+			maxX = -99999;
+		var minY = 99999,
+			maxY = -99999;
+		for (var i = 0; i < aliens.length; i++) {
+			var a = aliens[i];
+			if (!a.alive) continue;
+			minX = Math.min(minX, a.x - a.width / 2);
+			maxX = Math.max(maxX, a.x + a.width / 2);
+			minY = Math.min(minY, a.y - a.height / 2);
+			maxY = Math.max(maxY, a.y + a.height / 2);
+		}
+		var edgeHit = false;
+		if (alienDir === 1 && maxX + alienSpeed > 2048 - 40) edgeHit = true;
+		if (alienDir === -1 && minX - alienSpeed < 40) edgeHit = true;
+		if (edgeHit) {
+			alienDir *= -1;
+			for (var i = 0; i < aliens.length; i++) {
+				var a = aliens[i];
+				if (a.alive) a.y += alienMoveDown;
+			}
+		} else {
+			for (var i = 0; i < aliens.length; i++) {
+				var a = aliens[i];
+				if (a.alive) a.x += alienDir * alienSpeed;
+			}
+		}
+		// Aliens shoot
+		for (var i = 0; i < aliens.length; i++) {
+			var a = aliens[i];
+			if (!a.alive) continue;
+			// Only bottom-most alien in column can shoot
+			var isLowest = true;
+			for (var j = 0; j < aliens.length; j++) {
+				var b = aliens[j];
+				if (b.col === a.col && b.row > a.row && b.alive) {
+					isLowest = false;
+					break;
+				}
+			}
+			if (isLowest && Math.random() < alienShootChance) {
+				a.shoot();
+			}
+		}
+		// Check for aliens reaching bottom
+		for (var i = 0; i < aliens.length; i++) {
+			var a = aliens[i];
+			if (a.alive && a.y + a.height / 2 >= player.y - player.height / 2) {
+				LK.effects.flashScreen(0xff0000, 800);
+				LK.showGameOver();
+				return;
+			}
+		}
+		// Speed up as aliens die
+		var aliveCount = 0;
+		for (var i = 0; i < aliens.length; i++) if (aliens[i].alive) aliveCount++;
+		alienMoveInterval = Math.max(8, 32 - Math.floor((40 - aliveCount) / 2));
+	}
+	// Win condition
+	var allDead = true;
+	for (var i = 0; i < aliens.length; i++) if (aliens[i].alive) allDead = false;
+	if (allDead) {
+		LK.effects.flashScreen(0x00ff00, 800);
+		LK.setScore(score);
+		LK.showYouWin();
+		return;
+	}
+	// Powerup spawn
+	powerupTimer++;
+	if (powerupTimer > powerupInterval) {
+		powerupTimer = 0;
+		var p = new Powerup();
+		p.x = 200 + Math.random() * (2048 - 400);
+		p.y = -p.height;
+		powerups.push(p);
+		game.addChild(p);
+	}
+};
+// Set initial score
+LK.setScore(0);
+scoreTxt.setText(0);
\ No newline at end of file