My name is Chris Robinson and I am a high school teacher.
I run a Python lunch time group and teach the basics of Python as well as how to use the Pythonista specific modules.
In November last year, two of my students published games on the App Store.
Boxscape - https://itunes.apple.com/us/app/boxscape/id1053771238?mt=8
This game was created using only primitive drawing functions, no use of Layers at all.
Third Law - https://itunes.apple.com/us/app/third-law/id1054853024?mt=8
This game features a custom physics engine and was creating using custom subclasses of Layer.
Please see the App Store descriptions for more information.
Check them out!