/**** 
* Classes
****/ 
// Left/right arrow button for turret control
var ArrowButton = Container.expand(function () {
	var self = Container.call(this);
	// dir: -1 for left, 1 for right
	self.dir = 0;
	self.isDown = false;
	// Use a simple colored box as arrow background
	var bg = self.attachAsset('arrowBtnBg_' + Math.random(), {
		width: 180,
		height: 180,
		color: 0x222a36,
		shape: 'box',
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Draw arrow using a colored box as a triangle (simulate with rotation)
	var arrow = self.attachAsset('arrowBtnArrow_' + Math.random(), {
		width: 60,
		height: 120,
		color: 0x6ec6ff,
		shape: 'box',
		anchorX: 0.5,
		anchorY: 0.2
	});
	self.arrow = arrow;
	// Set direction
	self.setDirection = function (dir) {
		self.dir = dir;
		// Left: rotate -90deg, Right: rotate +90deg
		arrow.rotation = dir < 0 ? -Math.PI / 2 : Math.PI / 2;
	};
	// Touch events
	self.down = function () {
		self.isDown = true;
	};
	self.up = function () {
		self.isDown = false;
	};
	return self;
});
// Meteor class: Falling enemy
var Meteor = Container.expand(function () {
	var self = Container.call(this);
	var meteor = self.attachAsset('meteor', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Randomize speed and rotation
	self.speed = 12 + Math.random() * meteorSpeedBoost;
	self.rotationSpeed = (Math.random() - 0.5) * 0.08;
	// For intersection tracking
	self.lastIntersecting = false;
	self.update = function () {
		self.y += self.speed;
		self.rotation += self.rotationSpeed;
	};
	return self;
});
// Projectile class: Player's bullet
var Projectile = Container.expand(function () {
	var self = Container.call(this);
	var proj = self.attachAsset('projectile', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Default direction: straight up
	self.vx = 0;
	self.vy = -38;
	self.setDirection = function (dx, dy) {
		// Normalize and scale to projectile speed
		var len = Math.sqrt(dx * dx + dy * dy);
		if (len === 0) {
			self.vx = 0;
			self.vy = -38;
		} else {
			var speed = 38;
			self.vx = dx / len * speed;
			self.vy = dy / len * speed;
		}
		// Set rotation of projectile to match direction
		self.rotation = Math.atan2(self.vx, -self.vy);
	};
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
	};
	return self;
});
// Turret class: Player's cannon at the bottom
var Turret = Container.expand(function () {
	var self = Container.call(this);
	// Barrel
	var barrel = self.attachAsset('turretBarrel', {
		anchorX: 0.5,
		anchorY: 1,
		x: 0,
		y: 0
	});
	// Base
	var base = self.attachAsset('turretBase', {
		anchorX: 0.5,
		anchorY: 0,
		x: 0,
		y: 0
	});
	// For drag offset
	self.dragOffsetX = 0;
	// For firing cooldown
	self.canShoot = true;
	// Store barrel for aiming
	self.barrel = barrel;
	// Fire projectile toward (targetX, targetY)
	self.shoot = function (targetX, targetY) {
		if (!self.canShoot) return;
		self.canShoot = false;
		// Cooldown (fast)
		LK.setTimeout(function () {
			self.canShoot = true;
		}, 180);
		// If no target, shoot straight up
		var shootX = self.x;
		var shootY = self.y - barrel.height;
		var dx = 0,
			dy = -1;
		if (typeof targetX === "number" && typeof targetY === "number") {
			// Calculate direction from barrel tip to target
			var barrelTipX = self.x;
			var barrelTipY = self.y - barrel.height;
			dx = targetX - barrelTipX;
			dy = targetY - barrelTipY;
			// Prevent shooting downward
			if (dy > 0) {
				dx = 0;
				dy = -1;
			}
			// Aim barrel
			self.barrel.rotation = Math.atan2(dx, -dy);
		} else {
			// Reset barrel to straight up
			self.barrel.rotation = 0;
		}
		var proj = new Projectile();
		proj.x = self.x;
		proj.y = self.y - barrel.height;
		proj.setDirection(dx, dy);
		projectiles.push(proj);
		game.addChild(proj);
		LK.getSound('shoot').play();
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0a2233
});

/**** 
* Game Code
****/ 
// Sound effects
// Explosion effect (for future use)
// Earth: Ground at the bottom
// Meteor: Falling enemy
// Projectile: Player's bullet
// Turret: Defense cannon at the bottom
// Game variables
var turret;
var projectiles = [];
var meteors = [];
var earth;
var scoreTxt;
var livesTxt;
var dragNode = null;
var lastTouchX = 0;
var lives = 5;
var score = 0;
var meteorSpawnInterval = 60; // frames
var meteorSpeedBoost = 0; // increases as game progresses
var meteorTimer = 0;
// Add earth at the bottom
earth = LK.getAsset('earth', {
	anchorX: 0.5,
	anchorY: 1,
	x: 2048 / 2,
	y: 2732
});
game.addChild(earth);
// Add turret
turret = new Turret();
turret.x = 2048 / 2;
turret.y = 2732 - earth.height + 20;
game.addChild(turret);
// Score text (top center)
scoreTxt = new Text2('Score: 0', {
	size: 100,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Lives text (top right, avoid top left 100x100)
livesTxt = new Text2('Lives: 5', {
	size: 80,
	fill: 0xFFB300
});
livesTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(livesTxt);
// Add left/right arrow buttons for turret control (bottom left/right)
var leftArrowBtn = new ArrowButton();
leftArrowBtn.setDirection(-1);
leftArrowBtn.x = 200;
leftArrowBtn.y = 2732 - 220;
LK.gui.bottomLeft.addChild(leftArrowBtn);
var rightArrowBtn = new ArrowButton();
rightArrowBtn.setDirection(1);
rightArrowBtn.x = 2048 - 200;
rightArrowBtn.y = 2732 - 220;
LK.gui.bottomRight.addChild(rightArrowBtn);
// Register button events
leftArrowBtn.down = function () {
	leftArrowBtn.isDown = true;
};
leftArrowBtn.up = function () {
	leftArrowBtn.isDown = false;
};
rightArrowBtn.down = function () {
	rightArrowBtn.isDown = true;
};
rightArrowBtn.up = function () {
	rightArrowBtn.isDown = false;
};
// Handle dragging turret horizontally
game.down = function (x, y, obj) {
	// Only allow drag if touch is on or near the turret
	var local = game.toLocal({
		x: x,
		y: y
	});
	if (local.y > turret.y - 120 && local.y < turret.y + 80 && local.x > turret.x - 180 && local.x < turret.x + 180) {
		dragNode = turret;
		dragNode.dragOffsetX = local.x - turret.x;
		lastTouchX = local.x;
	}
};
game.move = function (x, y, obj) {
	if (dragNode) {
		var local = game.toLocal({
			x: x,
			y: y
		});
		var newX = local.x - dragNode.dragOffsetX;
		// Clamp within screen
		var minX = 110 + 60; // avoid left edge
		var maxX = 2048 - 60;
		dragNode.x = Math.max(minX, Math.min(maxX, newX));
		lastTouchX = local.x;
		// Rotate barrel to point toward drag/touch position
		var dx = local.x - dragNode.x;
		var dy = local.y - (dragNode.y - dragNode.barrel.height);
		// Prevent aiming downward
		if (dy > 0) {
			dx = 0;
			dy = -1;
		}
		dragNode.barrel.rotation = Math.atan2(dx, -dy);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Remove tap-to-shoot. Turret will auto-fire in the direction it is facing.
// Main update loop
game.update = function () {
	// Move turret with arrow buttons
	var moveSpeed = 32;
	if (typeof leftArrowBtn !== "undefined" && leftArrowBtn.isDown) {
		turret.x = Math.max(110 + 60, turret.x - moveSpeed);
	}
	if (typeof rightArrowBtn !== "undefined" && rightArrowBtn.isDown) {
		turret.x = Math.min(2048 - 60, turret.x + moveSpeed);
	}
	// Spawn meteors
	meteorTimer++;
	var spawnRate = Math.max(18, meteorSpawnInterval - Math.floor(score / 10) * 4);
	if (meteorTimer >= spawnRate) {
		meteorTimer = 0;
		var m = new Meteor();
		// Random X, avoid edges
		m.x = 120 + Math.random() * (2048 - 240);
		m.y = -80;
		meteors.push(m);
		game.addChild(m);
	}
	// Increase difficulty
	meteorSpeedBoost = Math.min(18, Math.floor(score / 8) * 2);
	// Auto-fire projectiles from turret at a fixed interval
	if (!turret.lastShotTick) turret.lastShotTick = 0;
	if (LK.ticks - turret.lastShotTick > 12) {
		// fire every 12 frames (~5 shots/sec)
		// Calculate direction from barrel rotation
		var angle = turret.barrel.rotation;
		var dx = Math.sin(angle);
		var dy = -Math.cos(angle);
		var proj = new Projectile();
		proj.x = turret.x;
		proj.y = turret.y - turret.barrel.height;
		proj.setDirection(dx, dy);
		projectiles.push(proj);
		game.addChild(proj);
		LK.getSound('shoot').play();
		turret.lastShotTick = LK.ticks;
	}
	// Update projectiles
	for (var i = projectiles.length - 1; i >= 0; i--) {
		var p = projectiles[i];
		p.update();
		// Remove if off screen
		if (p.y < -100) {
			p.destroy();
			projectiles.splice(i, 1);
			continue;
		}
		// Check collision with meteors
		for (var j = meteors.length - 1; j >= 0; j--) {
			var m = meteors[j];
			if (p.intersects(m)) {
				// Destroy both
				LK.getSound('hit').play();
				p.destroy();
				m.destroy();
				projectiles.splice(i, 1);
				meteors.splice(j, 1);
				score += 1;
				scoreTxt.setText('Score: ' + score);
				break;
			}
		}
	}
	// Update meteors
	for (var k = meteors.length - 1; k >= 0; k--) {
		var mtr = meteors[k];
		mtr.update();
		// If meteor hits earth
		if (mtr.y + 60 >= earth.y - earth.height / 2) {
			LK.getSound('lose').play();
			mtr.destroy();
			meteors.splice(k, 1);
			lives -= 1;
			livesTxt.setText('Lives: ' + lives);
			// Flash screen
			LK.effects.flashScreen(0xff0000, 400);
			if (lives <= 0) {
				LK.showGameOver();
				return;
			}
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,47 @@
 /**** 
 * Classes
 ****/ 
+// Left/right arrow button for turret control
+var ArrowButton = Container.expand(function () {
+	var self = Container.call(this);
+	// dir: -1 for left, 1 for right
+	self.dir = 0;
+	self.isDown = false;
+	// Use a simple colored box as arrow background
+	var bg = self.attachAsset('arrowBtnBg_' + Math.random(), {
+		width: 180,
+		height: 180,
+		color: 0x222a36,
+		shape: 'box',
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Draw arrow using a colored box as a triangle (simulate with rotation)
+	var arrow = self.attachAsset('arrowBtnArrow_' + Math.random(), {
+		width: 60,
+		height: 120,
+		color: 0x6ec6ff,
+		shape: 'box',
+		anchorX: 0.5,
+		anchorY: 0.2
+	});
+	self.arrow = arrow;
+	// Set direction
+	self.setDirection = function (dir) {
+		self.dir = dir;
+		// Left: rotate -90deg, Right: rotate +90deg
+		arrow.rotation = dir < 0 ? -Math.PI / 2 : Math.PI / 2;
+	};
+	// Touch events
+	self.down = function () {
+		self.isDown = true;
+	};
+	self.up = function () {
+		self.isDown = false;
+	};
+	return self;
+});
 // Meteor class: Falling enemy
 var Meteor = Container.expand(function () {
 	var self = Container.call(this);
 	var meteor = self.attachAsset('meteor', {
@@ -169,8 +209,32 @@
 	fill: 0xFFB300
 });
 livesTxt.anchor.set(1, 0);
 LK.gui.topRight.addChild(livesTxt);
+// Add left/right arrow buttons for turret control (bottom left/right)
+var leftArrowBtn = new ArrowButton();
+leftArrowBtn.setDirection(-1);
+leftArrowBtn.x = 200;
+leftArrowBtn.y = 2732 - 220;
+LK.gui.bottomLeft.addChild(leftArrowBtn);
+var rightArrowBtn = new ArrowButton();
+rightArrowBtn.setDirection(1);
+rightArrowBtn.x = 2048 - 200;
+rightArrowBtn.y = 2732 - 220;
+LK.gui.bottomRight.addChild(rightArrowBtn);
+// Register button events
+leftArrowBtn.down = function () {
+	leftArrowBtn.isDown = true;
+};
+leftArrowBtn.up = function () {
+	leftArrowBtn.isDown = false;
+};
+rightArrowBtn.down = function () {
+	rightArrowBtn.isDown = true;
+};
+rightArrowBtn.up = function () {
+	rightArrowBtn.isDown = false;
+};
 // Handle dragging turret horizontally
 game.down = function (x, y, obj) {
 	// Only allow drag if touch is on or near the turret
 	var local = game.toLocal({
@@ -194,25 +258,33 @@
 		var minX = 110 + 60; // avoid left edge
 		var maxX = 2048 - 60;
 		dragNode.x = Math.max(minX, Math.min(maxX, newX));
 		lastTouchX = local.x;
-		// Determine if touch is on left or right half of the screen
-		var screenMid = 2048 / 2;
-		if (local.x < screenMid) {
-			// Touch is on left half: rotate barrel left (limit to -60 degrees)
-			dragNode.barrel.rotation = Math.max(-Math.PI / 3, dragNode.barrel.rotation - 0.10);
-		} else {
-			// Touch is on right half: rotate barrel right (limit to +60 degrees)
-			dragNode.barrel.rotation = Math.min(Math.PI / 3, dragNode.barrel.rotation + 0.10);
+		// Rotate barrel to point toward drag/touch position
+		var dx = local.x - dragNode.x;
+		var dy = local.y - (dragNode.y - dragNode.barrel.height);
+		// Prevent aiming downward
+		if (dy > 0) {
+			dx = 0;
+			dy = -1;
 		}
+		dragNode.barrel.rotation = Math.atan2(dx, -dy);
 	}
 };
 game.up = function (x, y, obj) {
 	dragNode = null;
 };
 // Remove tap-to-shoot. Turret will auto-fire in the direction it is facing.
 // Main update loop
 game.update = function () {
+	// Move turret with arrow buttons
+	var moveSpeed = 32;
+	if (typeof leftArrowBtn !== "undefined" && leftArrowBtn.isDown) {
+		turret.x = Math.max(110 + 60, turret.x - moveSpeed);
+	}
+	if (typeof rightArrowBtn !== "undefined" && rightArrowBtn.isDown) {
+		turret.x = Math.min(2048 - 60, turret.x + moveSpeed);
+	}
 	// Spawn meteors
 	meteorTimer++;
 	var spawnRate = Math.max(18, meteorSpawnInterval - Math.floor(score / 10) * 4);
 	if (meteorTimer >= spawnRate) {