Well, how did Nick & Norah’s Infinite Playlist do? (Not very good, 31 million, but against a 9 million budget, so profitable.) That’s pretty similar, although without the comedic/videogame touches. Which I think widen the audience, although maybe some could be put off by perceived silliness. Playing up “by the director of Hot Fuzz/Shaun of the Dead” is probably a good idea to attract those genre-mashup audiences, too.