Great, but could be better
Like many before me, I like it to be possible to hide. When you're in first person and have 3d enviroment its easy to "get shot in the back" and die quickly. You should also work on the weapons. They are square and flat, and does not fit in in the overall "design" of the game. You should also work a bit on the rooms, make them look less square and more natural. If you could put in recoil on the weapons (and remember, more powerfull or high rate off fire, more recoil) it would be one of the best 1st person shooter. But that would just be a bonus, you should first take up things to improve, then add. You should also make it possible to turn off the music. I found it greatly annoying and I try the panel in the lower right corner, but it didnt do anything. Otherwize this is great work and could turn out to be a great game.