Nice entry! It's very.. mysterious. I really liked the dark mood that the visual style and music creates.
I too had trouble with jumping. I understand what you've said here about a more 'realistic' jump, and I feel the same way actually, but I didn't feel in control. I think it might just need a bit more refinement. I found the section where you jump up a series of boxes quite frustrating, especially as it's possible to slip off a box and fall back down to the bottom (or maybe I'm just hopeless?).
The first time I fell just short of escaping for the second time, and was just going to leave it at that. But then curiosity got the better of me and I played it again and was able to finish the whole thing. I was expecting some kind of narrative punchline and was a tiny bit disappointed. Even still, I liked this entry very much.