Function over functionality... What you have here is good, your graphics are really excellent, but the animation is minimal and simply not interesting. While the clown's face, the black and white scheme, and soundtrack are eerie and set the mood, the end result just seems like it's missing something, or maybe it's just unfinished.
A more detailed or drawn-out death sequence would have elaborated on the mood, I think. Or perhaps something showing the victim after he was dead, like his body in the foreground with the clown int he background. As it is, your animation ends a little too quickly for it to be ominous, which I think was the intention.