/**** 
* 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 = 19; // Decreased bullet speed by 100%
	self.dirX = 1;
	self.dirY = 0;
	self.pierce = 1; // Number of enemies bullet can hit before being destroyed (default 1)
	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_right', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 50;
	self.speed = 1.5 + Math.random(); // Decreased enemy speed by 100%
	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;
		}
		// Face the hero horizontally
		if (self.children && self.children.length > 0) {
			var currentSprite = self.children[0];
			// If hero is to the right of enemy, use enemy_right, else enemy_left
			var shouldFaceRight = hero.x > self.x;
			var isLeftSprite = currentSprite.assetId === 'enemy_left';
			var isRightSprite = currentSprite.assetId === 'enemy_right';
			if (shouldFaceRight && !isRightSprite) {
				self.removeChild(currentSprite);
				var newSprite = self.attachAsset('enemy_right', {
					anchorX: 0.5,
					anchorY: 0.5
				});
				newSprite.assetId = 'enemy_right';
			} else if (!shouldFaceRight && !isLeftSprite) {
				self.removeChild(currentSprite);
				var newSprite = self.attachAsset('enemy_left', {
					anchorX: 0.5,
					anchorY: 0.5
				});
				newSprite.assetId = 'enemy_left';
			}
		}
	};
	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_right', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 60; // for collision
	self.speed = 15; // movement speed per tick (set to 15)
	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);
			var prevX = self.x;
			self.x += dx / dist * move;
			self.y += dy / dist * move;
			// Change hero sprite based on movement direction
			if (self.children && self.children.length > 0) {
				var currentSprite = self.children[0];
				var isLeftSprite = currentSprite.assetId === 'hero_left';
				var isRightSprite = currentSprite.assetId === 'hero_right';
				if (self.x < prevX && !isLeftSprite) {
					self.removeChild(currentSprite);
					var newSprite = self.attachAsset('hero_left', {
						anchorX: 0.5,
						anchorY: 0.5
					});
					newSprite.assetId = 'hero_left';
				} else if (self.x > prevX && !isRightSprite) {
					self.removeChild(currentSprite);
					var newSprite = self.attachAsset('hero_right', {
						anchorX: 0.5,
						anchorY: 0.5
					});
					newSprite.assetId = 'hero_right';
				}
			}
		}
	};
	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: 54,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// GUI: Timer (top right)
var timerTxt = new Text2('00:00', {
	size: 54,
	fill: "#fff"
});
timerTxt.anchor.set(1, 0); // right aligned, top
LK.gui.topRight.addChild(timerTxt);
// GUI: XP
xpTxt = new Text2('XP: 0/10', {
	size: 36,
	fill: 0x7BE495
});
xpTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(xpTxt);
xpTxt.y = 110;
// GUI: Level
levelTxt = new Text2('Level: 1', {
	size: 36,
	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 edge = Math.floor(Math.random() * 4);
	var x, y;
	var useRight = false;
	if (edge === 0) {
		// top
		x = Math.random() * 2048;
		y = -100;
		if (x > 1024) useRight = true;
	} else if (edge === 1) {
		// right
		x = 2048 + 100;
		y = Math.random() * 2732;
		useRight = true;
	} else if (edge === 2) {
		// bottom
		x = Math.random() * 2048;
		y = 2732 + 100;
		if (x > 1024) useRight = true;
	} else {
		// left
		x = -100;
		y = Math.random() * 2732;
		// useRight remains false
	}
	var enemy = new Enemy();
	if (useRight && enemy.children && enemy.children.length > 0) {
		// Replace the enemy's sprite with enemy_left asset
		var oldSprite = enemy.children[0];
		enemy.removeChild(oldSprite);
		var enemyLeftSprite = enemy.attachAsset('enemy_left', {
			anchorX: 0.5,
			anchorY: 0.5
		});
	}
	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;
	bullet.pierce = Bullet.prototype.pierce || 1;
	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 = 48; // ticks between shots, decreased attack speed by 100%
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);
				// Bullet pierce logic
				b.pierce -= 1;
				if (b.pierce <= 0) {
					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);
				// Attack speed upgrade on level up
				autoAttackInterval = Math.max(12, autoAttackInterval - 4); // double minimum and decrement for 100% slower attack speed
				// Bullet pierce upgrade on level up
				Bullet.prototype.pierce = (Bullet.prototype.pierce || 1) + 1;
			}
		}
	}
	// 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(16, autoAttackInterval - 4); // double minimum and decrement for 100% slower attack speed
				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;
			// Fire multiple bullets in a spread, based on level
			var extraBullets = Math.max(0, level - 1);
			var totalBullets = 1 + extraBullets;
			// At level 2, spread is narrower, then increases as you level up
			var spread;
			if (level === 2) {
				spread = Math.PI / 32; // narrower at level 2
			} else if (level > 2) {
				spread = Math.PI / 32 + (level - 2) * Math.PI / 48; // increases with level
				// Cap spread to a reasonable max (e.g. 45 degrees)
				if (spread > Math.PI / 4) spread = Math.PI / 4;
			} else {
				spread = Math.PI / 16; // default for level 1
			}
			var baseAngle = Math.atan2(dy, dx);
			for (var b = 0; b < totalBullets; b++) {
				var angle = baseAngle;
				if (totalBullets > 1) {
					angle = baseAngle - spread / 2 + spread * b / (totalBullets - 1);
				}
				var dirX = Math.cos(angle);
				var dirY = Math.sin(angle);
				fireBullet(dirX, dirY);
			}
		} else {
			// No enemy, fire random
			var extraBullets = Math.max(0, level - 1);
			var totalBullets = 1 + extraBullets;
			// At level 2, spread is narrower, then increases as you level up
			var spread;
			if (level === 2) {
				spread = Math.PI / 32;
			} else if (level > 2) {
				spread = Math.PI / 32 + (level - 2) * Math.PI / 48;
				if (spread > Math.PI / 4) spread = Math.PI / 4;
			} else {
				spread = Math.PI / 16;
			}
			var baseAngle = Math.random() * Math.PI * 2;
			for (var b = 0; b < totalBullets; b++) {
				var angle = baseAngle;
				if (totalBullets > 1) {
					angle = baseAngle - spread / 2 + spread * b / (totalBullets - 1);
				}
				var dirX = Math.cos(angle);
				var dirY = Math.sin(angle);
				fireBullet(dirX, dirY);
			}
		}
	}
	// 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);
	// Update timer text (mm:ss)
	var totalSeconds = Math.floor(ticksSurvived / 60);
	var minutes = Math.floor(totalSeconds / 60);
	var seconds = totalSeconds % 60;
	var minStr = minutes < 10 ? '0' + minutes : '' + minutes;
	var secStr = seconds < 10 ? '0' + seconds : '' + seconds;
	timerTxt.setText(minStr + ':' + secStr);
	// Reset game over flag if game is running
	if (hero && hero.parent) lastGameOver = false;
};

===================================================================
--- original.js
+++ change.js
@@ -96,10 +96,32 @@
 		var dy = self.targetY - self.y;
 		var dist = Math.sqrt(dx * dx + dy * dy);
 		if (dist > 10) {
 			var move = Math.min(self.speed, dist);
+			var prevX = self.x;
 			self.x += dx / dist * move;
 			self.y += dy / dist * move;
+			// Change hero sprite based on movement direction
+			if (self.children && self.children.length > 0) {
+				var currentSprite = self.children[0];
+				var isLeftSprite = currentSprite.assetId === 'hero_left';
+				var isRightSprite = currentSprite.assetId === 'hero_right';
+				if (self.x < prevX && !isLeftSprite) {
+					self.removeChild(currentSprite);
+					var newSprite = self.attachAsset('hero_left', {
+						anchorX: 0.5,
+						anchorY: 0.5
+					});
+					newSprite.assetId = 'hero_left';
+				} else if (self.x > prevX && !isRightSprite) {
+					self.removeChild(currentSprite);
+					var newSprite = self.attachAsset('hero_right', {
+						anchorX: 0.5,
+						anchorY: 0.5
+					});
+					newSprite.assetId = 'hero_right';
+				}
+			}
 		}
 	};
 	return self;
 });