Cool little game. The only problem is that your character seems to be right-handed, so he aims a little bit to the right of the point that you'd expect him :)
Also, music is a bit too repetative and very much too loud. I always recomend to set background music to -18 or -21 db and add an ability to disable it easily when it starts to get too repetative.
Otherwise, quite a solid peace. It doesn't have a lot, but all that it has is polished.