I get squicked-out pretty easily, and I didn't find this too aversive. Art-wise, it's absolutely mesmerizing. I could definitely see this technique becoming a stable of the black metal / witch house / etc genres.

i have tripped dozens of times and never seen something like this. the visual mechanics are trippy but to see something like that i'd probably have to be in a really bad head space watching horror movies during the peak. never tried that, though. prefer to stick with documentaries and funny movies.