I've played it through several times. It's fun playing because it is different from pretty much every game out there now. It's original and a nice change, but it really is too short. The second time you play through the story you can cut the game time in half, and almost in half again the third time because you know the fastest routes, especially if you play the time trials. There aren't very many different moves, and the game really only uses 7 buttons including WASD, so it gets pretty easy. Also, there really is only one route to complete a level.
I don't know if it's worth $30, it all depends on how much money you have I suppose. Oh, and there is no multiplayer other than just trying to beat everyone's times.
edit: I played on pc. I forgot this was console forum, but it all pretty much still applies.