Excellent! Smooth and immersive in so many ways. Especially superb use of lighting!
The jumpscaresque flashes were a face flashes were cliche, but used sparingly enough that i think they added (it happened twice i think?). I didn't like the red mist though.
I'm not sure if this is just a limitation of the medium, but I've always felt unseen monsters are way scarier than seen ones. I'm not sure there's really a way you can run and hide from an immediate threat in a game without seeing the monster (original amnesia took a go at it once I suppose), but if there was a way to be (or at least feel) hunted without actually seeing the monster... but again, not sure there's really a good way to do it.
Really enjoyed it though!
Quick amendment -- The game didn't have a "disable headbob" option. Had I purchased this on steam, I would have returned it immediately as that triggers my motion sickness.