Let me give some more details about our project, but first of all we'd (me and my brother) like to thank you very much for your interest in our job.
We chose the Ruby library and we put in action many of the libraries (chingu, ashton, texplay, releasy, etc.) that are proposed in the main gosu page. To be more specific, we use a lot of chingu but with some changes to the source and some more additions in order to serve better our purposes.
For those who know and played in the past Wing Commander, we must admit that this project is going to be massive. We will try to cover most of the WC eras, that means in a few words: Many ships, many guns, many systems, storyline, cockpits, animations etc.
Up until now Gosu hasn't let me down, our game is pure 2D and everything goes smooth. In the only part that I still have my doubts and I am open for suggestions, is packaging. I haven't had the chance to test releasy yet and I am not sure about it's functionality.