Barbarian was good, from the recent horror movies I saw.

Hi, here’s some that are either based in the wilderness with supernatural elements and a few with some slasher elements in

• Mama (2013)
• Wrong Turn (2003) (the whole series is super goofy but it’s great)
• Antlers (2021)
• Maybe Hell House LLC (2015)
• The Ruins (2008)
• Wilderness (2006)
• The Hole In The Ground (2019)
• The Boys From County Hell (2020)
• The Accursed (2022)

Also gonna throw in Virus (1999), not related to spooky woods or slashers or anything but it doesn’t get enough love haha

Sleepaway Camp is a classic 80s camp movie.
Will also recommend The Burning