We could also do a horror spin of Little Mermaid, Rapunzel, and Beauty and the Beast.
I was thinking of Little Mermaid myself, specifically the original version! I do recall that when the Little Mermaid was a human, walking hurt. Badly.
It would be very easy to make a foreboding atmosphere in the Beast’s castle.
Rapunzel also has wandering through an unfamiliar environment going for it. From the Wikipedia article: “ In anger, the sorceress cuts off [Rapunzel’s] hair and casts her out into the wilderness to fend for herself.“ Plus, there’s the idea of being trapped in a tower. We could focus on the horror of isolation.