This is a nice little level. It reminds me of the goth-related plans you had in mind for your unfinished* level Corruption. Also, I noticed upon replaying that you don't actually need to get the high jump power-up to reach the end.
*my fault too, I guess.
Ha, I didn't remember that part, so I had to look it up; after review, I'd have to say that I don't quite see it, but then you might have a different image of it than I do. It does give me an idea for a prequel, though! Perhaps I should make it.
Re: high jump: I had some trouble reaching the key without it, but after a quick test I found an easier way to do it. Still, I like the additional room it's in (and I'm too lazy to change the level) so it'll probably stay.