This is one of the bleakest and most stressful horrors I've seen for a while.
The scares feel so patient, it's so confident in its scares that it can take its time building and building just pushing you further to the point that I was hoping it would just give in and throw itself at me.
When it does it truly feels like it's earned it, and somehow the intense scares aren't diminished at all by the build up.

The effects here are incredible too, I found myself gagging and wincing multiple times at what was thrown at the screen.

I do wish there was a little more that was left to the unknown. Ultimately I always think the unknown is scarier than knowing the 'rules' to a certain evil. Unfortunately the last third laid out these rules a little too thick for me and I wish it was maybe sprinkled throughout a little more and left things to my imagination.