Yeah, it's definitely up there in terms of, er, "creeper movies." I should really watch it again soon -it's a great movie.
However, while I'm not entirely clear on your definition of "creeper movie," I would like to nominate Elija Wood's recent movie Maniac
as a contender.
While not the most original horror movie ever and perhaps being a bit "problematic" in the gender relations department, it's a brilliantly well crafted film presenting the sort of stark, refusing to blink violence of a lot of French new wave horror films like Inside
and mixing it with the dark, psychological drama of Hitchcock. Its my theory that this was exactly their goal, especially considering the plot's striking similarities to Psycho
It's been a while since a movie has made me feel this uncomfortable while still managing to actually hold my interest and present something sincerely human -though some may find some of the humanizing elements to be a bit overtly melodramatic.