// Hero character
LK.init.shape('hero', {width: 100, height: 100, color: 0x00FF00, shape: 'ellipse'});

// Obstacle
LK.init.shape('obstacle', {width: 80, height: 80, color: 0xFF0000, shape: 'box'});

// Coin
LK.init.shape('coin', {width: 50, height: 50, color: 0xFFFF00, shape: 'ellipse'});

Classes

var Hero = Container.expand(function () {
    var self = Container.call(this);
    var heroGraphics = self.attachAsset('hero', {
        anchorX: 0.5,
        anchorY: 0.5
    });
    self.move = function (y) {
        self.y = y;
    };
});

var Obstacle = Container.expand(function () {
    var self = Container.call(this);
    var obstacleGraphics = self.attachAsset('obstacle', {
        anchorX: 0.5,
        anchorY: 0.5
    });
    self.speed = 5;
    self.move = function () {
        self.x -= self.speed;
    };
});

var Coin = Container.expand(function () {
    var self = Container.call(this);
    var coinGraphics = self.attachAsset('coin', {
        anchorX: 0.5,
        anchorY: 0.5
    });
    self.speed = 5;
    self.move = function () {
        self.x -= self.speed;
    };
});

Initialize Game

var game = new LK.Game({
    backgroundColor: 0x000000 // Init game with black background 
});

Game Code

var hero = game.addChild(new Hero());
hero.x = 200;
hero.y = 2732 / 2;

var obstacles = [];
var coins = [];
var score = 0;

var scoreTxt = new Text2(score.toString(), {
    size: 150,
    fill: "#ffffff"
});
LK.gui.top.addChild(scoreTxt);

game.on('down', function (obj) {
    var pos = obj.event.getLocalPosition(game);
    hero.move(pos.y);
});

LK.on('tick', function () {
    // Move obstacles and check for collision
    for (var i = obstacles.length - 1; i >= 0; i--) {
        obstacles[i].move();
        if (obstacles[i].x < -50) {
            obstacles[i].destroy();
            obstacles.splice(i, 1);
        } else if (hero.intersects(obstacles[i])) {
            LK.effects.flashScreen(0xff0000, 1000);
            LK.showGameOver();
        }
    }

    // Move coins and check for collection
    for (var j = coins.length - 1; j >= 0; j--) {
        coins[j].move();
        if (coins[j].x < -50) {
            coins[j].destroy();
            coins.splice(j, 1);
        } else if (hero.intersects(coins[j])) {
            score += 10;
            scoreTxt.setText(score.toString());
            coins[j].destroy();
            coins.splice(j, 1);
        }
    }

    // Spawn obstacles and coins
    if (LK.ticks % 120 == 0) {
        var newObstacle = new Obstacle();
        newObstacle.x = 2048;
        newObstacle.y = Math.random() * 2732;
        obstacles.push(newObstacle);
        game.addChild(newObstacle);
    }

    if (LK.ticks % 180 == 0) {
        var newCoin = new Coin();
        newCoin.x = 2048;
        newCoin.y = Math.random() * 2732;
        coins.push(newCoin);
        game.addChild(newCoin);
    }
});