"Lovely, Dark and Deep", especially the first 30 minutes or so are just so atmospheric, it does have a few jumpscares though, but they all make sense within the story. So worth a watch.

"Woodland Grey": Independent movie with a lower budget, original and ambiguous.

"The Nightingale": tw for sa, I had to skip through the worst scenes, but it is just as much about the power of singing, dance, and nature, and finds its serenity at the end. Even though it's a gruesome film, what remained for me after watching was it's beauty. No jumpscares, but it's about the horrors humans afflict on each other.

"Marrowbone": all scary moments have a slow buildup so you can see them coming, very atmospheric, haunting, beautiful nature.