/**** 
* Classes
****/ 
var Axe = Container.expand(function () {
	var self = Container.call(this);
	var axeGraphics = self.attachAsset('axe', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 20;
	self._move_migrated = function () {
		self.y -= self.speed;
		self.rotation += 0.1;
	};
});
var Target = Container.expand(function () {
	var self = Container.call(this);
	var targetGraphics = self.attachAsset('target', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.direction = 1;
	self._move_migrated = function () {
		self.x += self.speed * self.direction;
		if (self.x <= 0 || self.x >= 2048) {
			self.direction *= -1;
		}
	};
});

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

/**** 
* Game Code
****/ 
var background = game.attachAsset('green_grass_field', {});
background.width = 2048;
background.height = 2732;
var targets = [];
var axes = [];
var score = 0;
var kills = 0;
var targetSpeed = 5;
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff",
	font: "Impact",
	dropShadow: true,
	dropShadowColor: "#000000"
});
scoreTxt.anchor.set(.5, 0);
LK.gui.top.addChild(scoreTxt);
var spawnTargets = function spawnTargets() {
	for (var i = 0; i < 3; i++) {
		var target = game.addChild(new Target());
		target.speed = targetSpeed;
		target.x = Math.random() * 2048;
		target.y = Math.random() * (2732 - target.height * 2);
		targets.push(target);
	}
};
LK.on('tick', function () {
	if (targets.length == 0) {
		spawnTargets();
	}
});
var axe;
game.on('down', function (x, y, obj) {
	var pos = game.toLocal(obj.global);
	axe = game.addChild(new Axe());
	axe.x = pos.x;
	axe.y = 2732 - axe.height + 100;
	axes.push(axe);
});
LK.on('tick', function () {
	for (var i = 0; i < targets.length; i++) {
		targets[i]._move_migrated();
	}
	for (var i = 0; i < axes.length; i++) {
		axes[i]._move_migrated();
		if (axes[i].y < -50) {
			axes[i].destroy();
			axes.splice(i, 1);
		}
		if (axes[i].y <= 0) {
			LK.showGameOver();
		}
	}
	for (var i = 0; i < axes.length; i++) {
		for (var j = 0; j < targets.length; j++) {
			if (axes[i].intersects(targets[j])) {
				var distance = Math.sqrt(Math.pow(axes[i].x - targets[j].x, 2) + Math.pow(axes[i].y - targets[j].y, 2));
				score += Math.max(0, 100 - distance) + 50;
				scoreTxt.setText(score);
				axes[i].destroy();
				axes.splice(i, 1);
				targets[j].destroy();
				targets.splice(j, 1);
				kills++;
				if (kills % 3 == 0) {
					targetSpeed += 1;
				}
				break;
			}
		}
	}
});

===================================================================
--- original.js
+++ change.js
@@ -74,9 +74,9 @@
 game.on('down', function (x, y, obj) {
 	var pos = game.toLocal(obj.global);
 	axe = game.addChild(new Axe());
 	axe.x = pos.x;
-	axe.y = 2732 - axe.height + 50;
+	axe.y = 2732 - axe.height + 100;
 	axes.push(axe);
 });
 LK.on('tick', function () {
 	for (var i = 0; i < targets.length; i++) {