MakeGamesWithUs (http://makegameswith.us) co-founder here - to clarify, Chris wrote the entire game himself. We just taught him Objective C and did the art (that's what we do). Chris is a rockstar.
I like the idea of MakeGameWithUs, but I don't have any Apple products... do you have any plans to include Android Development, or Desktop Development into it ?
We'd love nothing more than to make iOS development available to non-Mac users and/or have our games be cross-platform. We're working on ways to achieve this but we probably won't be going there for at least a year. In the mean time where there's a will there's a way to get OS X running on your machine.