'K, several or more coming up here, starting with what I would have made last, but, fuck me, c'mon Anwar:
Satan's Slaves - never really paid much attention to Joko Anwar before this, now I am. Very good take on a possession thriller, Indonesians got horror pretty much figured out IMO.
Satan's Slaves: Communion - yeeeeesh. Loved this for the most part. Builds on the first one's story and makes it a classic horror film instead of a small-scope possession story like the first one, then it does a bit of a rug pull at the end. Probably my favorite horror movie of the past, I dunno 8 or 10 years, and uh, spoilers (?), get the finale done already. Seriously though, Anwar is the best or the second-best horror movie maker going right now depending on your thoughts on Jordan Peele (Ti West would probably challenge if he made more movies).
Significant Other - has an actress had a more noticeably-downward career trajectory from her first big role than Maika Monroe? Liked her a lot in It Follows, The Guest was good (though that was Dan Stevens and not her), and, well, any blonde would have been fine in this. Many reviews talk up the "twist," which is ridiculous. It's fine, but very boring and honestly kind of predictable. Don't bother.
Host - basically a British lockdown take on Unfriended. But also really good. Well worth the 55 minutes it takes to watch it and honestly a pretty cool achievement in making movies during COVID times.
The Invitation - again, yeeesh. Generally uncomfortable to watch from start to finish but in a good way. One of the best psychological horror films I've seen in a while, excellent performances all around. Reminded me a little of Convergence in the setup but then obviously goes its own way to good effect.
The Witch Part I: The Subversion - so, trying not to spoil things, this is what might happen if Eleven was a sadist-slash-supervillain. Kind of starts slow and then the final act is pretty amazing.
The Witch Part II: The Other One - so, this is what happens when you force a trilogy and basically just completely rehash the plot of the first movie but with much less quality. Honestly, skip this one and hope that the finale will be back in line with the original.
Home with a View of the Monster - mostly just incredibly weird, even for low (micro?)-budget indie horror. Story is unique, acting is good, writing is solid, and then the plot just takes a bizarre left turn for the final act and refuses to budge from there and ends in a fitting and completely unsatisfying way. It's mostly subjective in interpreting a lot of what ends up happening, but I just can't land on a worthwhile ending for, I dunno 90% of it. Fascinating but ultimately also kind of irritating. I hate to say this, but I totally do recommend it if you have any interest at all in more unique genre stuff. Your mileage, especially re: ending, may vary.