This is pretty good. The atmosphere and sound design is great and the monster design is good too. My only gripe is that failing is kinda weak. You get caught by a monster, and the game only fades to black and the level restarts. Other than that, it's a great experience and I would recommend it!
(also another gripe is can't sex the monster, like I got up behind it, also GYAT DAYUM, and everything and I died. the 'Adult' tag is mainly for Nudity of the one monster, but again; good game.)