Which isn't a disclaimer you usually have to worry about for an "immersive sim". Except this is like, the first. by default (I think) E is what you use to toggle mouselook/cursor lock. And you can collapse most of the big intrusive hud by pressing buttons on the side of the screen. And once you get used to that it's a pretty fantastic game. Every new floor feels like you're going down to a new floor in a dungeon crawler. Oppressive, mysterious, intriguing, exciting.