This feels like Half-Life except it's just Xen . . .
This game is suuuper creative and cool, especially with its procedural animations for characters, but it's got a lot of stuff just holding it back from being as fun as it could be.
Most important thing is that the gun does not aim correctly at the mouse at all, which makes it very frustrating to try and hit enemies when you are being chased by them. Also, your move speed is very slow; maybe add a sprint mechanic or something? Lastly that area where you have to equip your suit just seems to be unbeatable? I checked all the walls and there doesn't appear to be a way out, and I think I killed most if not all of the monsters there, but nothing happened.
Anyways I really want to see this game when it's got those problems worked out, because it's atmosphere is fantastic and it's got a bunch of neat ideas!