The start with the call was terrifying (the 911 operator less believable though).
The title cards went on for too long. Too many useless scenes (it's almost 2 hours some could have been cut). "Action" (non-filler scenes) start at 39 minute mark - that's too long.
The found footage either looks too much like found footage (its 2024 people have better skills than that, especially for someone who clearly documents their life as much as the camera person) or NOT enough like found footage (why is all so zoomed into the characters faces?). It probably also needed less clear sounding background music to be believable as found footage.
Blood and gore starts and then you don't really know what's happening.
The audio is terrifying.
He loses his clothes but somehow he's got the camera the whole time.
Is it skinwalkers and jumping dimensions?
TRIGGER WARNING at like 1:41 if you don't wanna see a peen cut off or guts dangling out (self mutilation). Why though???