I thought I was going to be productive tonight, but nope!
If it doesn't work as fully as, say, Ex Machina, I'd probably chalk it up to going surreal in the last act without letting the home-invasion angle go. At some point, the dream-like atmosphere just deflates the tension.
The first forest sequence, though, it's a 12-minute masterpiece in wordless suspense filmmaking β I've seen a lot of people trying to pull off the same beats it does and failingβ¦