Using Bugsnag yeah, I'm happy to say I haven't had any crashes yet! It's nice to know I'll see them if I do, plus it's free and really easy to add.

Thanks for everyone's nice comments! I just made it to be a fun project not sure it's worth charging anything for :)

It is of course your choice what to charge customers, if anything.

I often have the same thought when designing apps: "Is this worth paying even 99¢ for?" I then try to improve the app design to the point where it is worth paying for, if I would end up spending a lot of time developing it that is.

Btw, did you consider using Cocos2d-x (C++ and cross-platform)?