Very Good!
Definitely not what I expected. It was very David Lynchish, so I had a lot of what?? moments while watching, but everything came together at the end.
It was an excellent thriller, not so much a horror, and was also very sad. Anyone who sees it will understand.
BTW the poster is very misleading! Our protagonist puts on that mask for one second during the whole movie. It has nothing to do with the storyline at all. I have no clue why they chose that picture for the poster!