/**** 
* Classes
****/
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedY = 0;
	self.gravity = 0.5;
	self.jumpForce = -20;
	self.jump = function () {
		self.speedY = self.jumpForce;
	};
	self.update = function () {
		self.y += self.speedY;
		self.speedY += self.gravity;
		// Prevent hero from falling below the ground
		if (self.y > 2732 - 25) {
			self.y = 2732 - 25;
			self.speedY = 0;
		}
		// Make the player land on platforms
		for (var i = 0; i < obstacles.length; i++) {
			if (self.intersects(obstacles[i]) && self.speedY > 0) {
				self.y = obstacles[i].y - self.height / 2;
				self.speedY = 0;
			}
		}
	};
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedX = -5;
	self.move = function () {
		self.x += self.speedX;
	};
});
var Tower = Container.expand(function () {
	var self = Container.call(this);
	var towerGraphics = self.attachAsset('tower', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.x = 2048 / 2; // Center the tower
});

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

/**** 
* Game Code
****/
// Create static platforms
game.on('move', function (obj) {
	var pos = obj.event.getLocalPosition(game);
	hero.x = pos.x;
});
var obstacles = [];
for (var i = 0; i < 10; i++) {
	var platform = new Obstacle();
	platform.x = Math.random() * 2048;
	platform.y = Math.random() * 2732;
	obstacles.push(game.addChild(platform));
}
var hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2732 / 2;
var towers = [];
var obstacles = [];
// Create initial tower
var initialTower = game.addChild(new Tower());
// Handle touch to make the hero jump
game.on('down', function () {
	hero.jump();
});
// Game tick
LK.on('tick', function () {
	hero.update();
});

===================================================================
--- original.js
+++ change.js
@@ -8,9 +8,9 @@
 		anchorY: 0.5
 	});
 	self.speedY = 0;
 	self.gravity = 0.5;
-	self.jumpForce = -15;
+	self.jumpForce = -20;
 	self.jump = function () {
 		self.speedY = self.jumpForce;
 	};
 	self.update = function () {
@@ -20,8 +20,15 @@
 		if (self.y > 2732 - 25) {
 			self.y = 2732 - 25;
 			self.speedY = 0;
 		}
+		// Make the player land on platforms
+		for (var i = 0; i < obstacles.length; i++) {
+			if (self.intersects(obstacles[i]) && self.speedY > 0) {
+				self.y = obstacles[i].y - self.height / 2;
+				self.speedY = 0;
+			}
+		}
 	};
 });
 var Obstacle = Container.expand(function () {
 	var self = Container.call(this);