Hello. I see you want to update your game app like change splash screen, add second screen, add scoreboard, etc.
I am a Game developer with 6 years experience and I am good at Unity3D, cocos2d-x, HTML5, Phaser and so on.
I read your job post carefully and I am able to update features, even I can do scoreboard with Firebase.
I can start work right now so that please contact me for further details.
I am ready. Thanks.