Turning, and therefore aiming, in this game is really awkward, forcing you to pretty much just stand still and trade blows with the enemies, which have a lot of health, forcing you to take quite a bit of damage, and quite a bit of time standing still and mashing Ctrl in order to kill them and progress. The start of the game is also very punishing - you barely have enough ammo to kill the first enemy, and if you run out, you just have to restart, and this is made all the worse by it being so difficult to aim. There's also some buggy-looking hit detection when shooting around walls. That said, moving around is fine, outside of turning, the game looks good and I like the open level design. My favourite part of the game would probably be the death animations - they look just like the death animations in Doom! (From what I remember of it, at least)