There's room for improvement
Great little game, nice use of sound and textures (on the wall and sky) but it could still be improved. For one, add a short instructon page so that people know what they're doing before they start. Secondly, vary the enemies a bit and add a bit more animation to them. Lastly, vary the area that it takes place in, the narrow corridor wasn't too exciting, try and capture that Halo feel.