Well I have to admit I'm not too educated when it comes to the different licenses.
But what I agree to is that the music is used for the game, I'm credited for that, and that I get to put up the same songs in a portfolio of my own, linking to the project. And that it is distributed in the same manner the game is. Essentially, a part of the same "product".
I'm not sure what else there is to consider... perhaps advertising? If someone would make a small promo clip for this project, then by all means the music should be there too.