Hi there! I'd love to join-up and fill the composer role. Depending on their availability, I could even reach-out to some sound-designer friends of mine to handle that end.
I've completed one jam before, as well as a small indie-game project with a friend of mine; and my experience is entirely with Unity. While I haven't used GitHub before, I'm sure I can gain a basic-understanding of it before the jam begins in two weeks! Let me know if you'd like to bring me on whenever you get the chance!