var globalSpeed = 5;
var HitGraphic = Container.expand(function () {
	var self = Container.call(this);
	var hitGraphic = self.createAsset('hit', 'Hit Graphic', .5, .5);
	hitGraphic.scale.set(3);
	hitGraphic.alpha = 1;
	var fadeOutInterval = LK.setInterval(function () {
		hitGraphic.alpha -= 0.0167;
		if (hitGraphic.alpha <= 0) {
			LK.clearInterval(fadeOutInterval);
			self.destroy();
		}
	}, 16.67);
	LK.setTimeout(function () {
		self.destroy();
	}, 1000);
});
var Star = Container.expand(function () {
	var self = Container.call(this);
	var starGraphics = self.createAsset('star', 'Star Graphics', .5, .5);
	starGraphics.scale.set(2);
	self.lifetime = 3000;
	self.spawnTime = LK.ticks;
	LK.setTimeout(function () {
		self.destroy();
	}, self.lifetime);
});
var Opponent = Container.expand(function () {
	var self = Container.call(this);
	var opponentGraphics = self.createAsset('opponent', 'Opponent Graphics', .5, .5);
	opponentGraphics.scale.set(-3, 3);
	self.speed = globalSpeed;
	self.hitPoints = 3;
	self.move = function (heroX, heroY) {
		var dx = heroX - self.x;
		var dy = heroY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		self.x += self.speed * (dx / distance);
		self.y += self.speed * (dy / distance);
	};
	self.hit = function (punchX, punchY) {
		self.hitPoints--;
		var dx = self.x - punchX;
		var dy = self.y - punchY;
		var distance = Math.sqrt(dx * dx + dy * dy);
		var knockBackMultiplier = 1.2;
		self.x += 100 * knockBackMultiplier * (dx / distance);
		self.y += 100 * knockBackMultiplier * (dy / distance);
		if (self.hitPoints <= 0) {
			globalSpeed += 1;
			Punch.prototype.speed += 1;
			var hitGraphic = new HitGraphic();
			hitGraphic.x = self.x;
			hitGraphic.y = self.y;
			self.parent.addChild(hitGraphic);
			self.destroy();
		}
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero character', .5, .5);
	heroGraphics.scale.set(6);
	self.speed = 5;
	self.move = function () {};
	self.punch = function () {};
});
var Punch = Container.expand(function () {
	var self = Container.call(this);
	self.velocity = {
		x: 0,
		y: 0
	};
	self.setVelocity = function (targetX, targetY) {
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		self.velocity.x = self.speed * (dx / distance);
		self.velocity.y = self.speed * (dy / distance);
	};
	self.move = function () {
		self.x += self.velocity.x;
		self.y += self.velocity.y;
	};
	var punchGraphics = self.createAsset('punch', 'Punch Graphics', .5, .5);
	punchGraphics.scale.set(2);
	punchGraphics.rotation = Math.PI / 2;
	self.speed = globalSpeed * 3;
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var background = self.createAsset('boxingRing', 'Boxing Ring Background', 0, 0);
	background.scale.set(LK.stage.width / background.width, LK.stage.height / background.height);
	self.addChildAt(background, 0);
	var hero = self.addChild(new Hero());
	var enemies = [];
	var punches = [];
	var opponents = [];
	var opponentSpawnRate = 120;
	var opponentSpawnCounter = 0;
	var lastStarSpawnTime = 0;
	var star = null;
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	LK.gui.topCenter.addChild(scoreTxt);
	var isGameOver = false;
	var tickOffset = 0;
	var glovesKillsCount = 0;
	var speedIncreaseTimer = 0;
	var speedIncreaseInterval = 300;
	var speedMultiplier = 1;
	hero.x = hero.width / 2;
	hero.y = 2732 / 2;
	var punchCooldown = 500;
	var lastPunchTime = 0;
	LK.stage.on('down', function (obj) {
		var currentTime = Date.now();
		if (currentTime - lastPunchTime >= punchCooldown) {
			var event = obj.event;
			var tapPosition = event.getLocalPosition(self);
			var punch = new Punch();
			punch.x = hero.x;
			punch.y = hero.y;
			punch.setVelocity(tapPosition.x, tapPosition.y);
			punches.push(punch);
			self.addChild(punch);
			LK.effects.flashObject(hero, 0xffcc00, 100);
			lastPunchTime = currentTime;
		}
	});
	LK.on('tick', function () {
		hero.move();
		for (var i = punches.length - 1; i >= 0; i--) {
			var punch = punches[i];
			punch.move();
			var starHit = false;
			for (var j = opponents.length - 1; j >= 0; j--) {
				var opponent = opponents[j];
				if (star && punch.intersects(star)) {
					starHit = true;
					star.destroy();
					glovesKillsCount += 10;
					scoreTxt.setText(glovesKillsCount.toString());
					star = null;
				} else if (punch.intersects(opponent)) {
					opponent.hit(punch.x, punch.y);
					if (opponent.hitPoints <= 0) {
						glovesKillsCount++;
						scoreTxt.setText(glovesKillsCount.toString());
						opponents.splice(j, 1);
					} else {
						var hitGraphic = new HitGraphic();
						hitGraphic.x = (opponent.x + punch.x) / 2;
						hitGraphic.y = (opponent.y + punch.y) / 2;
						self.addChild(hitGraphic);
						LK.effects.flashObject(hitGraphic, 0xffffff, 1000);
					}
					starHit = false;
					punch.destroy();
					punches.splice(i, 1);
					break;
				}
			}
			if (starHit) {
				opponents.forEach(function (opponent) {
					opponent.destroy();
				});
				opponents = [];
				globalSpeed = 5;
				Punch.prototype.speed = globalSpeed * 2;
			}
		}
		if (!star && LK.ticks - lastStarSpawnTime >= 5 * 60) {
			star = new Star();
			star.x = LK.stage.width / 2 + Math.random() * (LK.stage.width / 2);
			star.y = LK.stage.height / 2;
			self.addChild(star);
			lastStarSpawnTime = LK.ticks;
		}
		speedIncreaseTimer++;
		if (speedIncreaseTimer >= speedIncreaseInterval) {
			if (LK.ticks % (5 * 60) === 0) {
				speedMultiplier += 0.2;
			}
			globalSpeed *= speedMultiplier;
			speedIncreaseTimer = 0;
		}
		if (opponentSpawnCounter++ >= opponentSpawnRate) {
			var opponent = new Opponent();
			opponent.speed += 0.5;
			opponent.x = LK.stage.width;
			opponent.y = Math.random() * (LK.stage.height - opponent.height) + opponent.height / 2;
			opponents.push(opponent);
			self.addChild(opponent);
			opponentSpawnCounter = 0;
		}
		for (var j = opponents.length - 1; j >= 0; j--) {
			var opponent = opponents[j];
			opponent.move(hero.x, hero.y);
			if (opponent.intersects(hero)) {
				isGameOver = true;
			}
			if (opponent.x + opponent.width / 2 < 0) {
				opponent.destroy();
				opponents.splice(j, 1);
			}
		}
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -1,19 +1,5 @@
 var globalSpeed = 5;
-var SpinningOpponent = Container.expand(function () {
-	var self = Container.call(this);
-	var opponentGraphics = self.createAsset('opponent', 'Opponent Graphics', .5, .5);
-	opponentGraphics.scale.set(-3, 3);
-	self.rotationSpeed = 0.1;
-	self.flyOffSpeed = -15;
-	self.update = function () {
-		self.x += self.flyOffSpeed;
-		self.rotation += self.rotationSpeed;
-		if (self.x + self.width / 2 < 0) {
-			self.destroy();
-		}
-	};
-});
 var HitGraphic = Container.expand(function () {
 	var self = Container.call(this);
 	var hitGraphic = self.createAsset('hit', 'Hit Graphic', .5, .5);
 	hitGraphic.scale.set(3);
@@ -62,12 +48,12 @@
 		self.y += 100 * knockBackMultiplier * (dy / distance);
 		if (self.hitPoints <= 0) {
 			globalSpeed += 1;
 			Punch.prototype.speed += 1;
-			var spinningOpponent = new SpinningOpponent();
-			spinningOpponent.x = self.x;
-			spinningOpponent.y = self.y;
-			self.parent.addChild(spinningOpponent);
+			var hitGraphic = new HitGraphic();
+			hitGraphic.x = self.x;
+			hitGraphic.y = self.y;
+			self.parent.addChild(hitGraphic);
 			self.destroy();
 		}
 	};
 });
@@ -212,11 +198,9 @@
 		}
 		for (var j = opponents.length - 1; j >= 0; j--) {
 			var opponent = opponents[j];
 			opponent.move(hero.x, hero.y);
-			if (opponent instanceof SpinningOpponent) {
-				opponent.update();
-			} else if (opponent.intersects(hero)) {
+			if (opponent.intersects(hero)) {
 				isGameOver = true;
 			}
 			if (opponent.x + opponent.width / 2 < 0) {
 				opponent.destroy();