I really liked this game! Very smooth and satisfying to shoot at things. The audio in general had a nice weight to it when you activated doors or fired.
A couple of nits! I would maybe like to move faster and jump higher? It isn't necessary, but I found that when there were no enemies, it took a bit to traverse areas. I may not have found the Shotgun or Machine Gun, because I wasn't able to change guns to utilize any ammo I found.