Ketchapp is the publisher who has many popular apps. Get inspritation from them. We made full design files for the game Floors (https://itunes.apple.com/us/app/floors/id980810759?mt=8)
They are including in the sale package:
1. Game Over screen 2. Home Screen 3. Play Screen 4. Other icon, art.
All the art is AI file. In the package that you buy will have 15 files in it. Please look at the sample images.
If you have any question, please leave it, I will answer you asap