I can say straight up this will not be a movie for everyone, but it really clicked for me. I would also say a blind watch is preferable in movies like this, I went in knowing almost nothing and if possible I think that's the way to watch the movie if possible.
For me it was incredibly immersive once established, with incredible sound design and score. The slow build of tension, unease and dread as things unfold. I'll admit, I've always been a fan of mediums that give the viewer the same amount of knowledge of whats going on as the characters have, and this nails that.
The premise has a whole has been done many times before, including this years Knock at the Cabin, but I've not seen that or read the book it was based on. But in relation to the other similar films, this takes the top spot for me.
While the ending itself is probably the weakest part of the movie for me personally because it answers just slightly too many questions a little bit too easily, the journey to get there was still worth the time and I think the ending might still work for others.