var Heart = Container.expand(function () {
	var self = Container.call(this);
	var heartGraphics = self.createAsset('heart', 'Heart icon', 0, 0);
});
var Santa = Container.expand(function () {
	var self = Container.call(this);
	var santaGraphics = self.createAsset('santa', 'Santa character', .5, .5);
	self.move = function () {};
	self.collect = function () {};
});
var Gift = Container.expand(function () {
	var self = Container.call(this);
	var giftGraphics = self.createAsset('gift', 'Gift item', .5, .5);
	self.drop = function () {
		self.y += 5;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var score = 0;
	var scoreTxt = new Text2(score.toString(), {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var lives = 3;
	var hearts = [];
	for (var i = 0; i < lives; i++) {
		var heart = new Heart();
		heart.x = i * (heart.width + 10);
		heart.y = 10;
		hearts.push(heart);
		LK.gui.topLeft.addChild(heart);
	}
	var santa = self.addChild(new Santa());
	var gifts = [];
	santa.x = 2048 / 2;
	santa.y = 2732 - santa.height;
	var giftCreationInterval = LK.setInterval(function () {
		var gift = new Gift();
		gift.x = Math.random() * 2048;
		gift.y = 0;
		gifts.push(gift);
		self.addChild(gift);
	}, 2000);
	LK.on('tick', function () {
		santa.move();
		for (var i = 0; i < gifts.length; i++) {
			gifts[i].drop();
			if (santa.intersects(gifts[i])) {
				santa.collect(gifts[i]);
				score++;
				scoreTxt.setText(score.toString());
				gifts[i].destroy();
				gifts.splice(i, 1);
				i--;
			} else if (gifts[i].y > 2732) {
				gifts[i].destroy();
				gifts.splice(i, 1);
				i--;
				if (--lives <= 0) {
					LK.showGameOver();
					var lateForChristmasText = new Text2('LATE FOR CHRISTMAS', {
						size: 150,
						fill: '#ffffff'
					});
					lateForChristmasText.x = 2048 / 2;
					lateForChristmasText.y = 2732 / 2 - 300;
					lateForChristmasText.anchor.set(0.5, 0.5);
					LK.gui.topCenter.addChild(lateForChristmasText);
					var scoreText = new Text2('Score: ' + score, {
						size: 120,
						fill: '#ffffff'
					});
					scoreText.x = 2048 / 2;
					scoreText.y = 2732 / 2 - 150;
					scoreText.anchor.set(0.5, 0.5);
					LK.gui.topCenter.addChild(scoreText);
					var highscoreKey = 'highscore';
					var highscore = Math.max(score, Number((typeof localStorage !== 'undefined' ? localStorage.getItem(highscoreKey) : '0') || '0'));
					localStorage.setItem('highscore', highscore.toString());
					LK.gui.topCenter.addChild(new Text2('Highscore: ' + highscore, {
						size: 120,
						fill: '#ffffff'
					}).set({
						x: 2048 / 2,
						y: 2732 / 2
					}).anchor.set(0.5, 0.5));
					var tryAgainButton = new Text2('Try Again', {
						size: 100,
						fill: '#ffffff'
					}).setInteractive(true).set({
						x: 2048 / 2,
						y: 2732 / 2 + 150
					}).anchor.set(0.5, 0.5);
					tryAgainButton.on('down', function () {
						LK.resetGame();
					});
					LK.gui.topCenter.addChild(tryAgainButton);
				}
			}
		}
	});
	stage.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		santa.x = pos.x;
	});
	stage.on('move', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		santa.x = pos.x;
	});
});

===================================================================
--- original.js
+++ change.js
@@ -77,9 +77,9 @@
 					scoreText.y = 2732 / 2 - 150;
 					scoreText.anchor.set(0.5, 0.5);
 					LK.gui.topCenter.addChild(scoreText);
 					var highscoreKey = 'highscore';
-					var highscore = Math.max(score, parseInt((typeof localStorage !== 'undefined' ? localStorage.getItem(highscoreKey) : '0') || '0', 10));
+					var highscore = Math.max(score, Number((typeof localStorage !== 'undefined' ? localStorage.getItem(highscoreKey) : '0') || '0'));
 					localStorage.setItem('highscore', highscore.toString());
 					LK.gui.topCenter.addChild(new Text2('Highscore: ' + highscore, {
 						size: 120,
 						fill: '#ffffff'