I feel like I might have seen this before as 4 separate shorts, especially the second one looked familiar (Brakhage was so prolific that it's kinda hard to even keep track), but in any case, I rather enjoyed it. Definitely a good piece to watch right before going to sleep.
Yup, still one of my favorite horror movies ever (if The Shining didn't exist, I would confidently say THE favorite), in fact it seems to get better and better with every rewatch. Relentlessly terrifying every time and somehow there are always new details to discover. Also, the camerawork is simply out of this world, certainly way better than I ever gave it credit for.
I have to admit, I've never been a huge fan of the ending, neither in the book nor in the movie. Maybe it's because I hate epilogues in general, but even without that, I think it should've been just a bit more ambiguous or at least less obvious. Other than that, it's still a great movie of course, but definitely among my least favorite in the franchise.