Awesome job making an FPS in a week. Really liked the art and the shooting mechanics.
Had some trouble with the mouse sensitivity due to the DPI of my mouse but I at least got through a few waves. One issue I had with the game was that you could flip the camera upside down by looking up too far -- most FPS games lock your look angle to a certain range so that you can't do this. Since you're in space it might be kind of cool to make it an intentional mechanic, though.