/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Asteroid
var Asteroid = Container.expand(function () {
	var self = Container.call(this);
	var asteroid = self.attachAsset('asteroid', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Randomize rotation
	asteroid.rotation = Math.random() * Math.PI * 2;
	// Speed and direction
	self.speedY = 7 + Math.random() * 4; // 7-11 px/frame
	self.speedX = (Math.random() - 0.5) * 4; // -2 to 2 px/frame
	// For collision
	self.radius = asteroid.width * 0.5;
	// For rotation animation
	self.rotSpeed = (Math.random() - 0.5) * 0.04;
	// Update method
	self.update = function () {
		self.y += self.speedY;
		self.x += self.speedX;
		asteroid.rotation += self.rotSpeed;
	};
	return self;
});
// Dog Ship (Player)
var DogShip = Container.expand(function () {
	var self = Container.call(this);
	var ship = self.attachAsset('dogShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For collision, use the container itself
	self.radius = ship.width * 0.5;
	// For drag effect
	self.isDragging = false;
	return self;
});
// Laser
var Laser = Container.expand(function () {
	var self = Container.call(this);
	var laser = self.attachAsset('laser', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedY = -22; // Fast upward
	// For collision
	self.radius = laser.width * 0.5;
	self.update = function () {
		self.y += self.speedY;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0a0a1a
});

/**** 
* Game Code
****/ 
// Play background music
// Spaceship (dog ship)
// Asteroid
// Laser
// Sound for shooting
// Sound for asteroid destroyed
// Music (background)
LK.playMusic('spaceMusic');
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Game variables
var dogShip;
var asteroids = [];
var lasers = [];
var dragNode = null;
var lastGameOver = false;
var asteroidSpawnTick = 0;
// Place dog ship at bottom center, above bottom edge
dogShip = new DogShip();
game.addChild(dogShip);
dogShip.x = 2048 / 2;
dogShip.y = 2732 - 320;
// Prevent dogShip from going off screen
function clampShipPosition() {
	var margin = dogShip.radius + 30;
	if (dogShip.x < margin) dogShip.x = margin;
	if (dogShip.x > 2048 - margin) dogShip.x = 2048 - margin;
	if (dogShip.y < margin + 120) dogShip.y = margin + 120; // Don't go under score
	if (dogShip.y > 2732 - margin) dogShip.y = 2732 - margin;
}
// Touch/mouse drag to move dog ship
function handleMove(x, y, obj) {
	if (dragNode) {
		dragNode.x = x;
		dragNode.y = y;
		clampShipPosition();
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only start drag if touch is on the ship
	var dx = x - dogShip.x;
	var dy = y - dogShip.y;
	if (dx * dx + dy * dy < dogShip.radius * dogShip.radius) {
		dragNode = dogShip;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Tap anywhere to shoot
game.tap = function (x, y, obj) {
	// Only allow shooting if not game over
	if (lastGameOver) return;
	var laser = new Laser();
	laser.x = dogShip.x;
	laser.y = dogShip.y - dogShip.radius - 30;
	lasers.push(laser);
	game.addChild(laser);
	LK.getSound('laserShoot').play();
};
// For mobile, treat down as tap if not dragging
game.down = function (x, y, obj) {
	var dx = x - dogShip.x;
	var dy = y - dogShip.y;
	if (dx * dx + dy * dy < dogShip.radius * dogShip.radius) {
		dragNode = dogShip;
		handleMove(x, y, obj);
	} else {
		// Not on ship: tap left/right to move, tap center to shoot
		// Define left/right/center regions
		var leftEdge = 0;
		var rightEdge = 2048;
		var centerWidth = 400;
		var leftRegion = (rightEdge - centerWidth) / 2;
		var rightRegion = (rightEdge + centerWidth) / 2;
		if (x < leftRegion) {
			// Move ship left by a fixed amount
			dogShip.x -= 220;
			clampShipPosition();
		} else if (x > rightRegion) {
			// Move ship right by a fixed amount
			dogShip.x += 220;
			clampShipPosition();
		} else {
			// Center: shoot
			game.tap(x, y, obj);
		}
	}
};
// Asteroid spawn logic
function spawnAsteroid() {
	var asteroid = new Asteroid();
	// Spawn at random X, just above top
	var margin = asteroid.radius + 40;
	asteroid.x = margin + Math.random() * (2048 - margin * 2);
	asteroid.y = -asteroid.radius - 40;
	asteroids.push(asteroid);
	game.addChild(asteroid);
}
// Collision detection (circle vs circle)
function circlesIntersect(a, b) {
	var dx = a.x - b.x;
	var dy = a.y - b.y;
	var r = a.radius + b.radius - 10; // -10 for some forgiveness
	return dx * dx + dy * dy < r * r;
}
// Main game update
game.update = function () {
	// Asteroid spawn rate: every 40-70 ticks, randomize for tension
	asteroidSpawnTick--;
	if (asteroidSpawnTick <= 0) {
		spawnAsteroid();
		asteroidSpawnTick = 40 + Math.floor(Math.random() * 30);
	}
	// Update asteroids
	for (var i = asteroids.length - 1; i >= 0; i--) {
		var a = asteroids[i];
		a.update();
		// Remove if off screen
		if (a.y - a.radius > 2732 + 60) {
			a.destroy();
			asteroids.splice(i, 1);
			continue;
		}
		// Check collision with dogShip
		if (!lastGameOver && circlesIntersect(a, dogShip)) {
			// Game over
			lastGameOver = true;
			LK.effects.flashScreen(0xff0000, 900);
			tween(dogShip, {
				alpha: 0.2
			}, {
				duration: 400,
				easing: tween.easeOut
			});
			LK.showGameOver();
			return;
		}
	}
	// Update lasers
	for (var j = lasers.length - 1; j >= 0; j--) {
		var l = lasers[j];
		l.update();
		// Remove if off screen
		if (l.y + l.radius < -60) {
			l.destroy();
			lasers.splice(j, 1);
			continue;
		}
		// Check collision with asteroids
		for (var k = asteroids.length - 1; k >= 0; k--) {
			var a2 = asteroids[k];
			if (circlesIntersect(l, a2)) {
				// Destroy both
				LK.getSound('asteroidHit').play();
				a2.destroy();
				asteroids.splice(k, 1);
				l.destroy();
				lasers.splice(j, 1);
				// Score up
				LK.setScore(LK.getScore() + 1);
				scoreTxt.setText(LK.getScore());
				// Small asteroid explosion effect
				LK.effects.flashObject(dogShip, 0x00e0ff, 200);
				break;
			}
		}
	}
};
// Reset state on new game
LK.on('gameStart', function () {
	// Remove all asteroids and lasers
	for (var i = 0; i < asteroids.length; i++) asteroids[i].destroy();
	for (var j = 0; j < lasers.length; j++) lasers[j].destroy();
	asteroids = [];
	lasers = [];
	// Reset dogShip
	dogShip.x = 2048 / 2;
	dogShip.y = 2732 - 320;
	dogShip.alpha = 1;
	lastGameOver = false;
	scoreTxt.setText('0');
	LK.setScore(0);
	asteroidSpawnTick = 30;
	clampShipPosition();
	// Restart music
	LK.playMusic('spaceMusic');
});

===================================================================
--- original.js
+++ change.js
@@ -68,15 +68,15 @@
 
 /**** 
 * Game Code
 ****/ 
-// Music (background)
-// Sound for asteroid destroyed
-// Sound for shooting
-// Laser
-// Asteroid
-// Spaceship (dog ship)
 // Play background music
+// Spaceship (dog ship)
+// Asteroid
+// Laser
+// Sound for shooting
+// Sound for asteroid destroyed
+// Music (background)
 LK.playMusic('spaceMusic');
 // Score display
 var scoreTxt = new Text2('0', {
 	size: 120,
@@ -143,10 +143,27 @@
 	if (dx * dx + dy * dy < dogShip.radius * dogShip.radius) {
 		dragNode = dogShip;
 		handleMove(x, y, obj);
 	} else {
-		// Not on ship, treat as tap to shoot
-		game.tap(x, y, obj);
+		// Not on ship: tap left/right to move, tap center to shoot
+		// Define left/right/center regions
+		var leftEdge = 0;
+		var rightEdge = 2048;
+		var centerWidth = 400;
+		var leftRegion = (rightEdge - centerWidth) / 2;
+		var rightRegion = (rightEdge + centerWidth) / 2;
+		if (x < leftRegion) {
+			// Move ship left by a fixed amount
+			dogShip.x -= 220;
+			clampShipPosition();
+		} else if (x > rightRegion) {
+			// Move ship right by a fixed amount
+			dogShip.x += 220;
+			clampShipPosition();
+		} else {
+			// Center: shoot
+			game.tap(x, y, obj);
+		}
 	}
 };
 // Asteroid spawn logic
 function spawnAsteroid() {