I feel the movement direction should be relative to the camera not where the character is facing; its very disorienting how it is now. The shooting felt decent. I think a reload would have added to the game loop nicely. Some sort of hit sound for shooting enemies would have been nice as the blood effect didn't always show. I would honestly say the hit sound would be more important than the blood FX here.
The ambient droning sound helps set the mood. The map looks neat even though its simple. The enemies look neat.
Overall a cool little experience.