Just finished watching this film and honestly I'm impressed. I can't give it 5 stars based on pure preference and I wouldn't say the category is something I would generally get excited about. That being said, for specifically a phycological horror film I thought it was well done.
It's extremely uncomfortable, has more originality that a lot of films and leaves you questioning the reasoning and methods of the worst human kind has to offer.
It's not a film I would say you can rewatch as it's main strength lies within the shock, but over all I enjoyed it a lot. If you want to watch a horror you need to bite your fisy whilst peering over a pillow it's a go to.