Audiosurf is music driven !
You really need to buy it fast !!!

I'm assuming you mean "Steam only" type of games, if that's the case I can only recommend Audiosurf as the only other music type game similar to Beat Hazard.

I absolutely love Audiosurf. Can't wait for the new Audiosurf in production ^_^

Guitar Hero 5

Any "Bit. Trip" game

FoF :)

I guess there's Chime. It kept me diverted for a few hours. Shame it hsa such a limited selection of music.

Audiosurf and Audiosurf ONLY.

drop that beat like an ugly baby is really a great underrated game

Beat Hazard (Dont play if you get seizures from flashing lights/colors)
Audiosurf

Audiosurf, Beat Hazard, AAAaaaaAAAAAAAaaaaAAAAAaaaaAAAAAAA!!! for the awesomeness, 1..2..3..Kick it!(Drop that Beat like an Ugly Baby), Bit Trip Beat, Bit Trip RUnner, Really Big Sky, Sequence.

Sequence

deffinitely