I want to have enjoyed this, but honestly, the art-work is so stylised and weird I have no idea what's going on in that entire final sequence. I can't even read the note. What does it even say?
I'm not horrified, I'm just confused.
See, I just don't think this type of thing works as horror. It's not horrifying, it's just... bizarre. "What the hell is even going on?" is really not a scary reaction.