The game looks great and the music fits well with the feel of the game.
However, although firing at the beat of the music sounds fun, it is not something you can use as a player unless you know the song by heart. The controls are also very hard. After going down the difficulty path from normal to easy to casual I finally mannaged to get some sort of aiming going by strafing but dodging the bullets seems impossible for me.
I managed to beat level 1 on casual once and then continued to die at level 2 so clearly I suck at the game. Even the game I won I got an F ;P
Again, great job on the graphics and the music feel. Just too difficult (for me ;P)