(This is not worthy of a bug report, so I just post it as a comment)1. The 'gear' icon is misleading. It's an edit button, not a button to change application 'settings'.
2. The text size is small. I understand that being delicate is part of this beautiful application's charm, and that it surely looks gorgeous on the new iPad's retina display, but I think you should have an option for a larger font size. Specially for the visually impaired, which otherwise I think can hardly use it.
3. Maybe a 'search' functionality (as opposed to directly typing 'username/repo') for adding other people's issues?
That said, I must say that I'm more than impressed. This app is extremely polished, pretty and intuitive. I've just seen a handful of apps that are more polished (and they were made by multi-million dollar companies, not as a learning experience).
I 100% recommend it. Awesome job.