===================================================================
--- original.js
+++ change.js
@@ -1,437 +1,196 @@
 /**** 
-* Plugins
-****/ 
-var tween = LK.import("@upit/tween.v1");
-
-/**** 
 * Classes
 ****/ 
-// Bullet class
-var Bullet = Container.expand(function () {
+var Bird = Container.expand(function () {
 	var self = Container.call(this);
-	var bulletGfx = self.attachAsset('bullet', {
+	var birdGraphics = self.attachAsset('bird', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	self.dx = 0;
-	self.dy = 0;
-	self.damage = 1;
-	self.lifetime = 60; // ticks
+	self.speedX = (Math.random() * 4 + 2) * (Math.random() > 0.5 ? 1 : -1);
+	self.speedY = Math.random() * 2 - 1;
+	self.lastX = 0;
+	self.lastY = 0;
 	self.update = function () {
-		self.x += self.dx;
-		self.y += self.dy;
-		self.lifetime--;
-		if (self.lifetime <= 0) {
-			self.destroy();
+		self.lastX = self.x;
+		self.lastY = self.y;
+		self.x += self.speedX;
+		self.y += self.speedY;
+		// Bounce off top and bottom
+		if (self.y < 100 || self.y > 2632) {
+			self.speedY *= -1;
 		}
 	};
 	return self;
 });
-// Enemy class
-var Enemy = Container.expand(function () {
+var Bullet = Container.expand(function () {
 	var self = Container.call(this);
-	var enemyGfx = self.attachAsset('enemyUnit', {
+	var bulletGraphics = self.attachAsset('bullet', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	self.hp = 2 + wave;
-	self.speed = 2 + 0.2 * wave;
-	self.targetX = commandCenterPos.x;
-	self.targetY = commandCenterPos.y;
-	self.reward = 10 + 2 * wave;
+	self.speedX = 0;
+	self.speedY = 0;
+	self.lastX = 0;
+	self.lastY = 0;
 	self.update = function () {
-		var dx = self.targetX - self.x;
-		var dy = self.targetY - self.y;
-		var dist = Math.sqrt(dx * dx + dy * dy);
-		if (dist > 2) {
-			self.x += dx / dist * self.speed;
-			self.y += dy / dist * self.speed;
-		}
+		self.lastX = self.x;
+		self.lastY = self.y;
+		self.x += self.speedX;
+		self.y += self.speedY;
 	};
 	return self;
 });
-// Turret class
-var Turret = Container.expand(function () {
+var Gun = Container.expand(function () {
 	var self = Container.call(this);
-	// Attach base
-	var base = self.attachAsset('turretBase', {
+	var gunGraphics = self.attachAsset('gun', {
 		anchorX: 0.5,
-		anchorY: 0.5
+		anchorY: 1.0
 	});
-	// Attach barrel
-	var barrel = self.attachAsset('turretBarrel', {
-		anchorX: 0.5,
-		anchorY: 0.85,
-		y: -30
-	});
-	self.level = 1;
-	self.fireRate = 60; // ticks between shots
-	self.lastShot = 0;
-	self.range = 500;
-	self.damage = 1;
-	self.upgrade = function () {
-		if (self.level < 3) {
-			self.level += 1;
-			self.fireRate = Math.max(30, self.fireRate - 10);
-			self.range += 80;
-			self.damage += 1;
-			// Animate upgrade
-			tween(self, {
-				scaleX: 1.2,
-				scaleY: 1.2
-			}, {
-				duration: 120,
-				easing: tween.easeOut,
-				onFinish: function onFinish() {
-					tween(self, {
-						scaleX: 1,
-						scaleY: 1
-					}, {
-						duration: 120,
-						easing: tween.easeIn
-					});
-				}
-			});
-		}
+	self.targetX = 0;
+	self.targetY = 0;
+	self.aimAt = function (x, y) {
+		self.targetX = x;
+		self.targetY = y;
+		var dx = x - self.x;
+		var dy = y - self.y;
+		var angle = Math.atan2(dy, dx);
+		gunGraphics.rotation = angle + Math.PI / 2;
 	};
-	// Find nearest enemy in range
-	self.findTarget = function () {
-		var minDist = self.range;
-		var target = null;
-		for (var i = 0; i < enemies.length; i++) {
-			var e = enemies[i];
-			var dx = e.x - self.x;
-			var dy = e.y - self.y;
-			var dist = Math.sqrt(dx * dx + dy * dy);
-			if (dist < minDist) {
-				minDist = dist;
-				target = e;
-			}
-		}
-		return target;
-	};
-	// Called every tick
-	self.update = function () {
-		// Find target
-		var target = self.findTarget();
-		if (target) {
-			// Rotate barrel towards target
-			var dx = target.x - self.x;
-			var dy = target.y - self.y;
-			var angle = Math.atan2(dy, dx) - Math.PI / 2;
-			barrel.rotation = angle;
-			// Fire if ready
-			if (LK.ticks - self.lastShot >= self.fireRate) {
-				self.lastShot = LK.ticks;
-				var b = new Bullet();
-				b.x = self.x;
-				b.y = self.y;
-				b.rotation = angle + Math.PI / 2;
-				b.dx = Math.cos(angle + Math.PI / 2) * 32;
-				b.dy = Math.sin(angle + Math.PI / 2) * 32;
-				b.damage = self.damage;
-				bullets.push(b);
-				game.addChild(b);
-			}
-		}
-	};
-	// Touch to upgrade
-	self.down = function (x, y, obj) {
-		if (resources >= turretUpgradeCost(self.level)) {
-			resources -= turretUpgradeCost(self.level);
-			self.upgrade();
-			updateResourceText();
-		}
-	};
 	return self;
 });
 
 /**** 
 * Initialize Game
 ****/ 
+// Game variables
 var game = new LK.Game({
-	backgroundColor: 0x222831
+	backgroundColor: 0x000000
 });
 
 /**** 
 * Game Code
 ****/ 
-// Build button
-// Upgrade button
-// Bullet
-// Enemy unit
-// Command center
-// Turret barrel
-// Turret base
-// Game constants
-var baseWidth = 2048;
-var baseHeight = 2732;
-var commandCenterPos = {
-	x: baseWidth / 2,
-	y: baseHeight - 350
-};
-var turretSpots = [{
-	x: baseWidth / 2 - 350,
-	y: baseHeight - 700
-}, {
-	x: baseWidth / 2 + 350,
-	y: baseHeight - 700
-}, {
-	x: baseWidth / 2 - 600,
-	y: baseHeight - 1100
-}, {
-	x: baseWidth / 2 + 600,
-	y: baseHeight - 1100
-}, {
-	x: baseWidth / 2,
-	y: baseHeight - 1100
-}];
-var maxTurrets = 5;
-var turretBuildCost = 50;
-function turretUpgradeCost(level) {
-	return 40 * level;
-}
-var wave = 1;
-var enemies = [];
+// Game variables
+var birds = [];
 var bullets = [];
-var turrets = [];
-var resources = 100;
-var commandCenterHP = 10;
-var isPlacingTurret = false;
-// Command Center
-var commandCenter = LK.getAsset('commandCenter', {
-	anchorX: 0.5,
-	anchorY: 0.5,
-	x: commandCenterPos.x,
-	y: commandCenterPos.y
-});
-game.addChild(commandCenter);
-// GUI: Resource display
-var resourceTxt = new Text2('Resources: 100', {
+var gun;
+var lastBirdSpawn = 0;
+var gameStarted = false;
+// Create gun at bottom center
+gun = game.addChild(new Gun());
+gun.x = 1024;
+gun.y = 2600;
+// Score display
+var scoreTxt = new Text2('Score: 0', {
 	size: 80,
-	fill: "#fff"
+	fill: 0xFFFFFF
 });
-resourceTxt.anchor.set(0.5, 0);
-LK.gui.top.addChild(resourceTxt);
-// GUI: Wave display
-var waveTxt = new Text2('Wave: 1', {
-	size: 80,
-	fill: "#fff"
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Instructions
+var instructionTxt = new Text2('Tap to aim and shoot flying birds!', {
+	size: 60,
+	fill: 0xFFFF00
 });
-waveTxt.anchor.set(0.5, 0);
-LK.gui.top.addChild(waveTxt);
-waveTxt.y = 90;
-// GUI: Command Center HP
-var hpTxt = new Text2('Base HP: 10', {
-	size: 80,
-	fill: "#fff"
-});
-hpTxt.anchor.set(0.5, 0);
-LK.gui.top.addChild(hpTxt);
-hpTxt.y = 180;
-// GUI: Build Turret Button
-var buildBtn = LK.getAsset('buildBtn', {
-	anchorX: 0.5,
-	anchorY: 0.5,
-	x: baseWidth / 2 - 250,
-	y: baseHeight - 180
-});
-var buildBtnTxt = new Text2('Build Turret\n50', {
-	size: 48,
-	fill: "#fff"
-});
-buildBtnTxt.anchor.set(0.5, 0.5);
-buildBtn.addChild(buildBtnTxt);
-game.addChild(buildBtn);
-// GUI: Upgrade All Button
-var upgradeBtn = LK.getAsset('upgradeBtn', {
-	anchorX: 0.5,
-	anchorY: 0.5,
-	x: baseWidth / 2 + 250,
-	y: baseHeight - 180
-});
-var upgradeBtnTxt = new Text2('Upgrade All', {
-	size: 48,
-	fill: "#fff"
-});
-upgradeBtnTxt.anchor.set(0.5, 0.5);
-upgradeBtn.addChild(upgradeBtnTxt);
-game.addChild(upgradeBtn);
-// Update resource text
-function updateResourceText() {
-	resourceTxt.setText('Resources: ' + resources);
-}
-function updateWaveText() {
-	waveTxt.setText('Wave: ' + wave);
-}
-function updateHPText() {
-	hpTxt.setText('Base HP: ' + commandCenterHP);
-}
-// Build turret on next available spot
-function buildTurret() {
-	if (resources < turretBuildCost) return;
-	if (turrets.length >= maxTurrets) return;
-	var spot = turretSpots[turrets.length];
-	var t = new Turret();
-	t.x = spot.x;
-	t.y = spot.y;
-	turrets.push(t);
-	game.addChild(t);
-	resources -= turretBuildCost;
-	updateResourceText();
-}
-// Upgrade all turrets
-function upgradeAllTurrets() {
-	for (var i = 0; i < turrets.length; i++) {
-		var t = turrets[i];
-		if (t.level < 3 && resources >= turretUpgradeCost(t.level)) {
-			resources -= turretUpgradeCost(t.level);
-			t.upgrade();
-		}
+instructionTxt.anchor.set(0.5, 0.5);
+instructionTxt.x = 1024;
+instructionTxt.y = 1366;
+game.addChild(instructionTxt);
+// Remove instructions after 3 seconds
+LK.setTimeout(function () {
+	if (instructionTxt.parent) {
+		instructionTxt.destroy();
 	}
-	updateResourceText();
-}
-// Build button event
-buildBtn.down = function (x, y, obj) {
-	buildTurret();
+}, 3000);
+// Game controls
+game.down = function (x, y, obj) {
+	gameStarted = true;
+	// Aim gun
+	gun.aimAt(x, y);
+	// Create bullet
+	var bullet = game.addChild(new Bullet());
+	bullet.x = gun.x;
+	bullet.y = gun.y - 60;
+	bullet.lastX = bullet.x;
+	bullet.lastY = bullet.y;
+	// Calculate bullet direction
+	var dx = x - gun.x;
+	var dy = y - gun.y;
+	var distance = Math.sqrt(dx * dx + dy * dy);
+	var speed = 15;
+	bullet.speedX = dx / distance * speed;
+	bullet.speedY = dy / distance * speed;
+	bullets.push(bullet);
+	// Play shoot sound
+	LK.getSound('shoot').play();
 };
-// Upgrade button event
-upgradeBtn.down = function (x, y, obj) {
-	upgradeAllTurrets();
-};
-// Place initial turret
-buildTurret();
-// Enemy spawn logic
-var spawnTimer = 0;
-var enemiesToSpawn = 0;
-function startWave() {
-	enemiesToSpawn = 4 + wave * 2;
-	spawnTimer = 0;
-	updateWaveText();
+// Spawn birds periodically
+function spawnBird() {
+	var bird = game.addChild(new Bird());
+	// Random spawn from sides
+	if (Math.random() > 0.5) {
+		bird.x = -50;
+		bird.speedX = Math.abs(bird.speedX);
+	} else {
+		bird.x = 2098;
+		bird.speedX = -Math.abs(bird.speedX);
+	}
+	bird.y = Math.random() * 1500 + 200;
+	bird.lastX = bird.x;
+	bird.lastY = bird.y;
+	birds.push(bird);
 }
-startWave();
 // Main game update
 game.update = function () {
-	// Turrets update
-	for (var i = 0; i < turrets.length; i++) {
-		turrets[i].update();
+	if (!gameStarted) return;
+	// Spawn birds
+	if (LK.ticks - lastBirdSpawn > 120) {
+		spawnBird();
+		lastBirdSpawn = LK.ticks;
 	}
-	// Bullets update
-	for (var i = bullets.length - 1; i >= 0; i--) {
-		var b = bullets[i];
-		b.update();
-		// Remove if out of bounds
-		if (b.x < -100 || b.x > baseWidth + 100 || b.y < -100 || b.y > baseHeight + 100 || b.lifetime <= 0) {
-			b.destroy();
-			bullets.splice(i, 1);
+	// Update and check birds
+	for (var i = birds.length - 1; i >= 0; i--) {
+		var bird = birds[i];
+		// Remove birds that flew off screen
+		if (bird.lastX >= -100 && bird.x < -100) {
+			bird.destroy();
+			birds.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)) {
-				e.hp -= b.damage;
-				b.destroy();
-				bullets.splice(i, 1);
-				// Animate hit
-				tween(e, {
-					scaleX: 1.2,
-					scaleY: 1.2
-				}, {
-					duration: 80,
-					onFinish: function onFinish() {
-						tween(e, {
-							scaleX: 1,
-							scaleY: 1
-						}, {
-							duration: 80
-						});
-					}
-				});
-				if (e.hp <= 0) {
-					// Enemy destroyed
-					resources += e.reward;
-					updateResourceText();
-					e.destroy();
-					enemies.splice(j, 1);
-				}
-				break;
-			}
+		if (bird.lastX <= 2148 && bird.x > 2148) {
+			bird.destroy();
+			birds.splice(i, 1);
+			continue;
 		}
 	}
-	// Enemies update
-	for (var i = enemies.length - 1; i >= 0; i--) {
-		var e = enemies[i];
-		e.update();
-		// Check if reached command center
-		if (e.intersects(commandCenter)) {
-			commandCenterHP -= 1;
-			updateHPText();
-			// Animate base hit
-			LK.effects.flashObject(commandCenter, 0xff0000, 300);
-			e.destroy();
-			enemies.splice(i, 1);
-			if (commandCenterHP <= 0) {
-				LK.effects.flashScreen(0xff0000, 1000);
-				LK.showGameOver();
-				return;
-			}
+	// Update and check bullets
+	for (var j = bullets.length - 1; j >= 0; j--) {
+		var bullet = bullets[j];
+		// Remove bullets that go off screen
+		if (bullet.x < -50 || bullet.x > 2098 || bullet.y < -50 || bullet.y > 2782) {
+			bullet.destroy();
+			bullets.splice(j, 1);
+			continue;
 		}
-	}
-	// Enemy spawn
-	if (enemiesToSpawn > 0) {
-		if (spawnTimer <= 0) {
-			// Spawn enemy at random edge
-			var edge = Math.floor(Math.random() * 3);
-			var ex, ey;
-			if (edge === 0) {
-				// left
-				ex = 100;
-				ey = 600 + Math.random() * 800;
-			} else if (edge === 1) {
-				// right
-				ex = baseWidth - 100;
-				ey = 600 + Math.random() * 800;
-			} else {
-				// top
-				ex = baseWidth / 2 - 400 + Math.random() * 800;
-				ey = 100;
+		// Check bullet-bird collisions
+		for (var k = birds.length - 1; k >= 0; k--) {
+			var bird = birds[k];
+			if (bullet.intersects(bird)) {
+				// Hit!
+				LK.setScore(LK.getScore() + 10);
+				scoreTxt.setText('Score: ' + LK.getScore());
+				// Play hit sound
+				LK.getSound('hit').play();
+				// Flash bird and remove
+				LK.effects.flashObject(bird, 0xff0000, 200);
+				// Remove bullet and bird
+				bullet.destroy();
+				bullets.splice(j, 1);
+				bird.destroy();
+				birds.splice(k, 1);
+				break;
 			}
-			var enemy = new Enemy();
-			enemy.x = ex;
-			enemy.y = ey;
-			enemies.push(enemy);
-			game.addChild(enemy);
-			enemiesToSpawn--;
-			spawnTimer = Math.max(30, 90 - wave * 2);
-		} else {
-			spawnTimer--;
 		}
-	} else if (enemies.length === 0) {
-		// Next wave
-		wave++;
-		commandCenterHP = Math.min(10, commandCenterHP + 2);
-		updateHPText();
-		startWave();
 	}
-};
-// Touch to upgrade turrets directly
-game.down = function (x, y, obj) {
-	// Check if touch is on a turret
-	for (var i = 0; i < turrets.length; i++) {
-		var t = turrets[i];
-		var dx = x - t.x;
-		var dy = y - t.y;
-		if (dx * dx + dy * dy < 100 * 100) {
-			// Try upgrade
-			if (resources >= turretUpgradeCost(t.level) && t.level < 3) {
-				resources -= turretUpgradeCost(t.level);
-				t.upgrade();
-				updateResourceText();
-			}
-			return;
-		}
-	}
-};
-// Prevent placing elements in top left 100x100
-// (All GUI is centered or at bottom, so nothing to do here)
\ No newline at end of file
+};
\ No newline at end of file