Well, to be honest, I read through a few other reviews before making my own, and noticed you gave off a lot of responses to criticism. Always a good idea.
As for the dark humor aspect, it's not always that easy for some people to take humor in his pain. Often, even without much characterization, I find myself connecting to the character in some way or another, and tend to get real depressed if they're depressed, or real uplifted if they're having a good day. This kinda humor is, unfortunately, acquired... If nothing else, the random events did make me laugh.
I do, however, greatly appreciate the style of this. You used a very simplistic look, almost childish. From frame to frame, his legs seemed to shrink and grow, different things changed position, etc. And of course, the b/w with splashes of red made the blood seem like a very important part of the piece, adding to the overall dark tone.