The game starts windowed but goes fullscreen after file creation. Loading screens show the main menu (because it's loaded underneath?). Text boxes are advanced using escape? Why is space not mapped to anything? Default mouse sensitivity is way too high. The game is really choppy, has regular frame hiccups. No reticle? The game does not teach you how its shooting mechanics work. The sound effects are very clearly stolen from Half-Life. Every door being a separate loading zone is really lame, since the cells are tiny. I don't like how complex the controls are. Only having a laser sight when aiming with the RMB is bizarre, and made me think blind-firing was the intended method.
The presentation and atmosphere is great, but the game is (likely purposefully) frustrating to play. I would have much preferred if it played like System Shock 2.