Though this is stylish there’s nothing new here. If it were a fraction of the running time, had fewer pretensions, and was entertaining I might claim it was in the style of a Hammer movie. It isn’t. It goes on and on. You can anticipate each revelation in the story until it finally gets to the big one that you will have spotted early on at the sanitarium. And then there’s a later bizarre scene of rebellion/insanity. Meh.
The sanitarium exploration is very much in the spirit of Scooby Doo or teen horror flicks: go weird places, find weird things, and then try and get away.
There are some jump shocks. Lots of persistent eeriness. And some scenes of typical fears: drowning, falling, teeth falling out, teeth being drilled, baths of eels, corpse defiling, menstruation, thugs, madness…
Overall though it is worth avoiding. Wait for it on DVD, play it at 1.5x or 2x and you will miss nothing and get to use the time you save more wisely.