Anyone who tells you they didn't find Skinamarink scary is lying to you. If you like horror, you have to see it. I've experienced nothing like it before.
The closest comparison I have, honestly, is Joseph Cornell's Rose Hobart (1936) – a silent experimental film that took footage of the title actress, slowed it down, tinted everything in blue, and used odd music. Imagine that kind of hypnotic, haptic weirdness, but applied to horror – and done well. That's Skinamarink. No horror movie has ever made me feel that way while scaring me.
Gonna be a while before I shake this one off. Wow.