[Phynx]

Star, I like the idea of individualizing this game apart from most other rhythm games and I would go as far as to endorse the idea. But for the sake of the users, leave the customization options up to them. Where I think you'd show the most individualization in it is how you scored(judged) the way people played the game. If you have a completely unique way of scoring, that alone is enough to set your game off from the rest of the herd.