/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -5;
	self.update = function () {
		self.y += self.speed;
	};
});
// Explosion class
var Explosion = Container.expand(function () {
	var self = Container.call(this);
	var explosionGraphics = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lifetime = 30; // Duration of the explosion effect
	self.update = function () {
		self.lifetime--;
		if (self.lifetime <= 0) {
			self.destroy();
		}
	};
});
// Missile class
var Missile = Container.expand(function () {
	var self = Container.call(this);
	var missileGraphics = self.attachAsset('missile', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
	};
});
// Space DOT class
var SpaceDOT = Container.expand(function () {
	var self = Container.call(this);
	var dotGraphics = self.attachAsset('spaceDOT', {
		anchorX: 0.0,
		anchorY: 0.5
	});
	self.speed = 5;
	self.health = 3;
	self.healthBar = self.attachAsset('healthBar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// self.healthBar.y = -self.height / 2 - 10; // Position the health bar above the DOT
	self.healthBar.scaleX = self.health / 3;
	// self.healthBar.y = self.y - self.height / 2 - 10; // Update the health bar position
	self.update = function () {
		// Calculate direction towards the truck
		var dx = truck.x - self.x;
		var dy = truck.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0.1) {
			// Prevent division by zero
			if (dy > 0) {
				// Only move downwards
				self.y += dy / distance * self.speed;
			}
		}
		self.healthBar.scaleX = self.health / 3; // Set scaleX to 1 when health is 3
		self.healthBar.x = self.x - self.healthBar.width * self.healthBar.scaleX / 2; // Center the health bar horizontally
		self.healthBar.y = self.y - self.height / 2 - 10; // Position the health bar directly above the DOT
		if (self.y > 2732) {
			self.y = -self.height;
		}
	};
});
// Space Pirate class
var SpacePirate = Container.expand(function () {
	var self = Container.call(this);
	var pirateGraphics = self.attachAsset('spacePirate', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = -self.height;
		}
		// Space pirates fire missiles
		if (LK.ticks % 60 == 0) {
			var newMissile = new Missile();
			newMissile.x = self.x;
			newMissile.y = self.y;
			// Calculate direction towards the truck
			var dx = truck.x - self.x;
			var dy = truck.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			newMissile.vx = dx / distance * newMissile.speed;
			newMissile.vy = dy / distance * newMissile.speed;
			missiles.push(newMissile);
			game.addChild(newMissile);
		}
	};
});
//<Assets used in the game will automatically appear here>
// Truck class
var Truck = Container.expand(function () {
	var self = Container.call(this);
	var truckGraphics = self.attachAsset('truck', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		// Truck movement logic
		// Touch-based controls for truck movement
		game.move = function (x, y, obj) {
			self.x = x;
			self.y = y;
		};
		if (LK.ticks % 30 == 0) {
			var newBullet = new Bullet();
			newBullet.x = self.x;
			newBullet.y = self.y;
			bullets.push(newBullet);
			game.addChild(newBullet);
		}
	};
	self.move = function (x, y, obj) {
		self.x = x;
		self.y = y;
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background
});

/**** 
* Game Code
****/ 
// Initialize stars
for (var i = 0; i < 100; i++) {
	var redStar = game.addChild(LK.getAsset('redStar', {
		x: Math.random() * 2048,
		y: Math.random() * 2732
	}));
	var blueStar = game.addChild(LK.getAsset('blueStar', {
		x: Math.random() * 2048,
		y: Math.random() * 2732
	}));
	var yellowStar = game.addChild(LK.getAsset('yellowStar', {
		x: Math.random() * 2048,
		y: Math.random() * 2732
	}));
}
// Initialize bullets
var bullets = [];
// Initialize missiles
var missiles = [];
// Initialize truck
var truck = game.addChild(new Truck());
truck.x = 2048 / 2;
truck.y = 2732 - 200;
// Initialize space pirates
var spacePirates = [];
var pirateSpawnInterval = LK.setInterval(function () {
	var pirate = new SpacePirate();
	pirate.x = Math.random() * 2048;
	pirate.y = Math.random() * -2732; // Ensure pirates spawn off-screen initially
	spacePirates.push(pirate);
	game.addChild(pirate);
}, 5000); // Spawn a pirate every 5 seconds
// Initialize space DOTs
var spaceDOTs = [];
var dotSpawnInterval = LK.setInterval(function () {
	var dot = new SpaceDOT();
	dot.x = Math.random() * 2048;
	dot.y = Math.random() * -500;
	spaceDOTs.push(dot);
	game.addChild(dot);
}, 10000); // Spawn a DOT every 10 seconds
// Handle truck movement
game.move = function (x, y, obj) {
	truck.x = x;
	truck.y = y;
};
// Display current points at the top of the screen in white letters and numbers, in a retro font
var scoreDisplay = new Text2('Score: 0', {
	size: 50,
	fill: "#ffffff",
	font: "'Press Start 2P', cursive" // Retro font
});
scoreDisplay.anchor.set(0.5, 0); // Center the text horizontally
LK.gui.top.addChild(scoreDisplay);
// Update game logic
game.update = function () {
	// Update score display
	scoreDisplay.setText('Score: ' + LK.getScore());
	// Update game logic
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].update();
		// Remove bullets that go off screen
		if (bullets[i].y < -50) {
			game.removeChild(bullets[i]);
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with space pirates
		for (var j = spacePirates.length - 1; j >= 0; j--) {
			if (bullets[i].intersects(spacePirates[j])) {
				game.removeChild(bullets[i]);
				var explosion = new Explosion();
				explosion.x = spacePirates[j].x;
				explosion.y = spacePirates[j].y;
				game.addChild(explosion);
				game.removeChild(spacePirates[j]);
				bullets.splice(i, 1);
				spacePirates.splice(j, 1);
				LK.setScore(LK.getScore() + 5); // Add 5 points for destroying a space pirate
				break;
			}
		}
		// Check collision with spaceDOTs
		for (var j = spaceDOTs.length - 1; j >= 0; j--) {
			if (bullets[i] && bullets[i].intersects(spaceDOTs[j])) {
				game.removeChild(bullets[i]);
				bullets.splice(i, 1);
				spaceDOTs[j].health -= 1;
				if (spaceDOTs[j].health <= 0) {
					var explosion = new Explosion();
					explosion.x = spaceDOTs[j].x;
					explosion.y = spaceDOTs[j].y;
					game.addChild(explosion);
					game.removeChild(spaceDOTs[j]);
					spaceDOTs.splice(j, 1);
					LK.setScore(LK.getScore() + 15); // Add 15 points for destroying a DOT
				}
				break;
			}
		}
	}
	for (var i = 0; i < spacePirates.length; i++) {
		spacePirates[i].update();
		// If a space pirate is destroyed, spawn a new one
		if (spacePirates.length == 0) {
			var pirate = new SpacePirate();
			pirate.x = Math.random() * 2048;
			pirate.y = Math.random() * -2732;
			spacePirates.push(pirate);
			game.addChild(pirate);
		}
	}
	// Update space DOTs
	for (var i = 0; i < spaceDOTs.length; i++) {
		spaceDOTs[i].update();
		// Check collision with truck
		if (spaceDOTs[i].intersects(truck)) {
			var explosion = new Explosion();
			explosion.x = spaceDOTs[i].x;
			explosion.y = spaceDOTs[i].y;
			game.addChild(explosion);
			game.removeChild(spaceDOTs[i]);
			spaceDOTs.splice(i, 1);
			LK.setScore(LK.getScore() - 15); // Subtract 15 points for collision with the truck
		}
	}
	// Update missiles
	for (var i = missiles.length - 1; i >= 0; i--) {
		missiles[i].update();
		// Remove missiles that go off screen
		if (missiles[i].y > 2732 || missiles[i].x < -50 || missiles[i].x > 2098) {
			game.removeChild(missiles[i]);
			missiles.splice(i, 1);
			continue;
		}
		// Check collision with truck
		if (missiles[i].intersects(truck)) {
			game.removeChild(missiles[i]);
			missiles.splice(i, 1);
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -63,10 +63,12 @@
 		var dy = truck.y - self.y;
 		var distance = Math.sqrt(dx * dx + dy * dy);
 		if (distance > 0.1) {
 			// Prevent division by zero
-			self.x += dx / distance * self.speed;
-			self.y += dy / distance * self.speed;
+			if (dy > 0) {
+				// Only move downwards
+				self.y += dy / distance * self.speed;
+			}
 		}
 		self.healthBar.scaleX = self.health / 3; // Set scaleX to 1 when health is 3
 		self.healthBar.x = self.x - self.healthBar.width * self.healthBar.scaleX / 2; // Center the health bar horizontally
 		self.healthBar.y = self.y - self.height / 2 - 10; // Position the health bar directly above the DOT