var Footballer = Container.expand(function () {
	var self = Container.call(this);
	var footballerGraphics = self.createAsset('footballer', 'Player Footballer', .5, 1);
	footballerGraphics.scale.set(2);
	self.move = function (position) {
		self.x = position.x;
	};
});
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballGraphics = self.createAsset('ball', 'Juggling Ball', .5, .5);
	self.speedY = -5;
	self.speedModifier = 0;
	self.move = function () {
		self.x += self.speedX;
		self.y += self.speedY;
		self.speedY += 0.98 + LK.ticks / 50000;
		if (self.y >= 2732 - self.height / 2) {
			self.y = 2732 - self.height / 2;
			self.speedY = -60;
		}
		if (self.x <= 0) {
			self.x = 0;
			self.speedX *= -1;
		}
		if (self.x >= 2048 - self.width) {
			self.x = 2048 - self.width;
			self.speedX *= -1;
		}
		if (self.y < 0) {
			self.speedY *= -0.5;
		}
	};
	self.bounce = function (speedX, speedY) {
		self.speedX = speedX;
		var difficultyMultiplier = 1 + Math.floor(score / 5) * 0.1;
		self.speedY = (speedY * (5.4 + difficultyMultiplier) + LK.ticks / 1800) * (1 + LK.ticks / 50000);
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var ball = self.addChild(new Ball());
	ball.x = 2048 / 2;
	ball.y = 2732 / 2;
	var footballer = self.addChild(new Footballer());
	footballer.x = 2048 / 2;
	footballer.y = 2732 - footballer.height / 2;
	stage.on('move', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		footballer.move(pos);
	});
	var score = 0;
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var isGameOver = false;
	ball.on('down', function (obj) {
		var kickStrengthX = 0;
		var kickStrengthY = -20;
		ball.bounce(kickStrengthX, kickStrengthY);
		score++;
		scoreTxt.setText(score);
	});
	LK.on('tick', function () {
		ball.move();
		if (ball.intersects(footballer) && ball.speedY > 0) {
			var relativeIntersectX = ball.x + ball.width / 2 - (footballer.x + footballer.width / 2);
			var normalizedRelativeIntersectionX = 2 * relativeIntersectX / footballer.width;
			var bounceAngle = normalizedRelativeIntersectionX * Math.PI / 4;
			ball.speedY = -60 * Math.cos(bounceAngle);
			ball.speedX = 60 * Math.sin(bounceAngle);
			score++;
			scoreTxt.setText(score);
		}
		if (ball.y >= 2732 - ball.height / 2) {
			isGameOver = true;
		}
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -13,9 +13,9 @@
 	self.speedModifier = 0;
 	self.move = function () {
 		self.x += self.speedX;
 		self.y += self.speedY;
-		self.speedY += 0.98;
+		self.speedY += 0.98 + LK.ticks / 50000;
 		if (self.y >= 2732 - self.height / 2) {
 			self.y = 2732 - self.height / 2;
 			self.speedY = -60;
 		}