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

/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletSprite = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 18;
	self.speed = 38;
	self.dirX = 1;
	self.dirY = 0;
	self.update = function () {
		self.x += self.dirX * self.speed;
		self.y += self.dirY * self.speed;
	};
	return self;
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemySprite = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 50;
	self.speed = 6 + Math.random() * 4; // randomize a bit
	self.update = function () {
		// Move toward hero
		var dx = hero.x - self.x;
		var dy = hero.y - self.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist > 0) {
			self.x += dx / dist * self.speed;
			self.y += dy / dist * self.speed;
		}
	};
	return self;
});
// Experience Gem class
var Gem = Container.expand(function () {
	var self = Container.call(this);
	var gemSprite = self.attachAsset('xp_gem', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 20;
	self.update = function () {};
	return self;
});
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroSprite = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 60; // for collision
	self.speed = 18; // movement speed per tick
	self.targetX = 1024;
	self.targetY = 1366;
	self.update = function () {
		// Move towards targetX, targetY (set by touch/mouse)
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist > 10) {
			var move = Math.min(self.speed, dist);
			self.x += dx / dist * move;
			self.y += dy / dist * move;
		}
	};
	return self;
});
// Powerup class
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	var powerupSprite = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 30;
	self.update = function () {};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Powerup
// Experience Gem
// Bullet
// Enemy
// Hero
// Game state variables
var hero;
var enemies = [];
var bullets = [];
var gems = [];
var powerups = [];
var spawnTimer = 0;
var spawnInterval = 90; // ticks between spawns, will decrease
var wave = 1;
var xp = 0;
var xpToLevel = 10;
var level = 1;
var dragging = false;
var lastGameOver = false;
var scoreTxt, xpTxt, levelTxt;
// Center positions
var centerX = 2048 / 2;
var centerY = 2732 / 2;
// Create hero
hero = new Hero();
hero.x = centerX;
hero.y = centerY;
game.addChild(hero);
// GUI: Score (time survived)
scoreTxt = new Text2('Score: 0', {
	size: 90,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// GUI: XP
xpTxt = new Text2('XP: 0/10', {
	size: 60,
	fill: 0x7BE495
});
xpTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(xpTxt);
xpTxt.y = 110;
// GUI: Level
levelTxt = new Text2('Level: 1', {
	size: 60,
	fill: 0xF7E967
});
levelTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(levelTxt);
levelTxt.y = 180;
// Helper: spawn enemy at random edge
function spawnEnemy() {
	var enemy = new Enemy();
	var edge = Math.floor(Math.random() * 4);
	var x, y;
	if (edge === 0) {
		// top
		x = Math.random() * 2048;
		y = -100;
	} else if (edge === 1) {
		// right
		x = 2048 + 100;
		y = Math.random() * 2732;
	} else if (edge === 2) {
		// bottom
		x = Math.random() * 2048;
		y = 2732 + 100;
	} else {
		// left
		x = -100;
		y = Math.random() * 2732;
	}
	enemy.x = x;
	enemy.y = y;
	enemies.push(enemy);
	game.addChild(enemy);
}
// Helper: spawn gem at (x, y)
function spawnGem(x, y) {
	var gem = new Gem();
	gem.x = x;
	gem.y = y;
	gems.push(gem);
	game.addChild(gem);
}
// Helper: spawn powerup at (x, y)
function spawnPowerup(x, y) {
	var powerup = new Powerup();
	powerup.x = x;
	powerup.y = y;
	powerups.push(powerup);
	game.addChild(powerup);
}
// Helper: fire bullet in direction (dx, dy)
function fireBullet(dx, dy) {
	var bullet = new Bullet();
	bullet.x = hero.x;
	bullet.y = hero.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (dist === 0) {
		bullet.dirX = 1;
		bullet.dirY = 0;
	} else {
		bullet.dirX = dx / dist;
		bullet.dirY = dy / dist;
	}
	bullet.rotation = Math.atan2(bullet.dirY, bullet.dirX);
	bullets.push(bullet);
	game.addChild(bullet);
}
// Helper: get random direction
function randomDir() {
	var angle = Math.random() * Math.PI * 2;
	return {
		x: Math.cos(angle),
		y: Math.sin(angle)
	};
}
// Helper: distance between two objects
function dist2(a, b) {
	var dx = a.x - b.x;
	var dy = a.y - b.y;
	return Math.sqrt(dx * dx + dy * dy);
}
// Handle movement (touch/mouse)
game.down = function (x, y, obj) {
	// Don't allow drag in top left 100x100
	if (x < 100 && y < 100) return;
	hero.targetX = x;
	hero.targetY = y;
	dragging = true;
};
game.move = function (x, y, obj) {
	// Always update hero's target position to follow the pointer
	hero.targetX = x;
	hero.targetY = y;
};
game.up = function (x, y, obj) {
	dragging = false;
};
// Main update loop
var ticksSurvived = 0;
var autoAttackTimer = 0;
var autoAttackInterval = 24; // ticks between shots
game.update = function () {
	// Update hero
	hero.update();
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		e.update();
		// Check collision with hero
		if (dist2(e, hero) < e.radius + hero.radius) {
			if (!lastGameOver) {
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				lastGameOver = true;
			}
			return;
		}
	}
	// Update bullets
	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 > 2148 || b.y < -100 || b.y > 2832) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		for (var j = enemies.length - 1; j >= 0; j--) {
			var e = enemies[j];
			if (dist2(b, e) < b.radius + e.radius) {
				// Enemy dies, spawn gem
				spawnGem(e.x, e.y);
				// Chance to spawn powerup
				if (Math.random() < 0.08) {
					spawnPowerup(e.x, e.y);
				}
				e.destroy();
				enemies.splice(j, 1);
				b.destroy();
				bullets.splice(i, 1);
				break;
			}
		}
	}
	// Update gems
	for (var i = gems.length - 1; i >= 0; i--) {
		var g = gems[i];
		// If close to hero, attract
		var d = dist2(g, hero);
		if (d < 300) {
			var dx = hero.x - g.x;
			var dy = hero.y - g.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist > 0) {
				g.x += dx / dist * 18;
				g.y += dy / dist * 18;
			}
		}
		// Collect
		if (dist2(g, hero) < g.radius + hero.radius) {
			xp += 1;
			g.destroy();
			gems.splice(i, 1);
			// Level up
			if (xp >= xpToLevel) {
				level += 1;
				xp = 0;
				xpToLevel = 10 + level * 4;
				// Show level up effect
				LK.effects.flashObject(hero, 0xf7e967, 600);
				// Powerup on level up
				spawnPowerup(hero.x + (Math.random() - 0.5) * 200, hero.y + (Math.random() - 0.5) * 200);
			}
		}
	}
	// Update powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var p = powerups[i];
		// Attract if close
		var d = dist2(p, hero);
		if (d < 300) {
			var dx = hero.x - p.x;
			var dy = hero.y - p.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist > 0) {
				p.x += dx / dist * 12;
				p.y += dy / dist * 12;
			}
		}
		// Collect
		if (dist2(p, hero) < p.radius + hero.radius) {
			// Powerup: random effect (for MVP, just increase fire rate or speed)
			if (Math.random() < 0.5) {
				// Increase fire rate
				autoAttackInterval = Math.max(8, autoAttackInterval - 2);
				LK.effects.flashObject(hero, 0x8e44ad, 400);
			} else {
				// Increase move speed
				hero.speed += 2;
				LK.effects.flashObject(hero, 0x7be495, 400);
			}
			p.destroy();
			powerups.splice(i, 1);
		}
	}
	// Auto-attack: fire bullet at nearest enemy
	autoAttackTimer++;
	if (autoAttackTimer >= autoAttackInterval) {
		autoAttackTimer = 0;
		// Find nearest enemy
		var nearest = null,
			minDist = 99999;
		for (var i = 0; i < enemies.length; i++) {
			var e = enemies[i];
			var d = dist2(hero, e);
			if (d < minDist) {
				minDist = d;
				nearest = e;
			}
		}
		if (nearest) {
			var dx = nearest.x - hero.x;
			var dy = nearest.y - hero.y;
			fireBullet(dx, dy);
		} else {
			// No enemy, fire random
			var dir = randomDir();
			fireBullet(dir.x, dir.y);
		}
	}
	// Enemy spawn logic
	spawnTimer++;
	if (spawnTimer >= spawnInterval) {
		spawnTimer = 0;
		// Spawn more enemies as time goes on
		var toSpawn = 1 + Math.floor(wave / 3);
		for (var i = 0; i < toSpawn; i++) {
			spawnEnemy();
		}
		wave++;
		// Decrease interval to increase difficulty, min 24
		spawnInterval = Math.max(24, 90 - Math.floor(wave / 2));
	}
	// Update GUI
	ticksSurvived++;
	scoreTxt.setText('Score: ' + Math.floor(ticksSurvived / 60));
	xpTxt.setText('XP: ' + xp + '/' + xpToLevel);
	levelTxt.setText('Level: ' + level);
	// Reset game over flag if game is running
	if (hero && hero.parent) lastGameOver = false;
};

===================================================================
--- original.js
+++ change.js
@@ -100,14 +100,14 @@
 
 /**** 
 * Game Code
 ****/ 
-// Game state variables
-// Hero
-// Enemy
-// Bullet
-// Experience Gem
 // Powerup
+// Experience Gem
+// Bullet
+// Enemy
+// Hero
+// Game state variables
 var hero;
 var enemies = [];
 var bullets = [];
 var gems = [];
@@ -234,12 +234,11 @@
 	hero.targetY = y;
 	dragging = true;
 };
 game.move = function (x, y, obj) {
-	if (dragging) {
-		hero.targetX = x;
-		hero.targetY = y;
-	}
+	// Always update hero's target position to follow the pointer
+	hero.targetX = x;
+	hero.targetY = y;
 };
 game.up = function (x, y, obj) {
 	dragging = false;
 };