I think I shall classify this as a 'thriller' rather than 'horror,' because it's mostly a long, dark, atmospheric mood piece wrapped in cable-knit sweaters.
Act I was super predictable (but jarring nonetheless), and if Deadpool were reviewing the film he'd likely say Acts II and III are equally unsurprising and expected because Act I included "a big heaping bowl of foreshadowing," but they are jarring in their own unique ways.
I believe, like Hereditary, The Lodge is one of those films you first experience, and then the wheels start turning afterward. That appears to be the case for me.
I found the film a bit of an underwhelming nothingburger at the time, but in retrospect it communicates quite a bit about loss, how we process it, and consequences thereof.
If you relish mostly silent, dialogue-free exposés in which the gravitational pull of people's destinies overpowers their better judgment, loss is the order of the day, and symbolism peeks out from every shadowy corner, nook, and cranny, you need to check into the lodge.
Trouble is, far as I can tell, your destiny may be that promised by the nightman of Hotel California.