For the most part, this game is sublime.
The graphics are stellar: the glowey-blue wireframe look is fantastic, and happens to meet my tastes to a point.
The sound design is fantastic as well - glitchy, electronic and intense. It matches the graphics beautifully.
Gameplay is very solid, if not particularly groundbreaking. The speed and mechanics of combat and movement are firm as granite.
The music, however, is where the game falls flat. The music in the opening and menu screens is great, but ingame... it sounded like lounge slow jazz with an electronic beat. It simply didn't have enough power to drive the game like it should have, and it REALLY didn't match the sound and visual feel. Piano would be okay for something like this, but something more minor, less flowery. Really, you want something with a heavy electronic focus, and maybe light interaction with piano, choir, or orchestra.
If the music were swapped out, it would be my idea of a perfect multi-directional shooter. Overall, though, great work.