“Behind the Mask: The Rise of Leslie Vernon.” It plays into horror tropes using "found footage. "

Also, “Digging Up the Marrow.” It’s another found footage, but it’s down to earth (in storytelling, not plot) with AMAZING practical effects and an actor who is way too hilarious to fit his role. If you like adult swim you’ll recognize him.

Edit:

Also, “Oats Studios” is awesome. “series of experimental short films that envision post-apocalyptic worlds and nightmarish scenarios” -imdb

SCP: Overlord by Evan Royalty is free on YouTube and a fun watch.

Also, people might be over it, but I don’t think they realize it’s being updated - Kane Pixels is making more “Back Rooms” content on YouTube aswell.

Hard for me to gauge “lesser known” without knowing what you’ve seen, but here are some I have enjoyed:

• Raw (2016)
• I See You (2019)
• The Autopsy (2022) - not feature length
• Hell House, LLC (2015)
• Pontypool (2008)

You could try looking back through !horrormovies@lemm.ee but a couple of recent posts:

• The Best Overlooked Horror Movies You Must Stream in October
• 10 Underrated Horror Movies That Are Perfect From Start to Finish

Koyaanisqatsi.