I'm digging the concept of this, though for whatever reason it's not really obvious in the execution. I mean, think... oh for hell's sake, I just had the name, but... think... you know, that one other game that generates levels based on the song, in the form of a sort of roller-coaster-y "dodge these colored blocks and pick up those ones" deal. Anyway, that one makes the correlation between the song and the level immediately obvious, as you go faster or slower with the tempo, the road gets noticeably bumpier in machine gun drum segments, etc. I won't dispute the fact that you took the song as a seed for the random level generation, but... I don't know, it doesn't really show up in-game as much, I guess!

Also, the laser is obviously the best weapon because it's the only one with which you can hold down the mouse button for continuous fire. What is this, Cosmic Gate? :)