Hey thanks for bringing that up, now that I look at the credits on the page I agree they make it hard to trace back to the songs. I'll see with the others if we can get that fixed at least for the page, for the game though upload is blocked until the gamejam judging period ends so we can't update yet.
Edit : Pardon my ignorance but what does a game have to do to comply to cc-by-sa-nc ? Everything I read online is quite confusing.