Not bad all round
The animation and artwork were quite impressive. Storyline was nothing particularly special (but how often is it in a flash of any kind?).
Mostly, the thing that brought it down was the offputting swaps between a depression/anger/revenge storyline and some slapped in humour.
It was kind of a case of some bits attempting to appeal to the viewer's emotions, but the overall flash because of the mood swapping would be most enjoyed by someone who was fairly emotionally detached. The mix plain didn't work. Either go one way or the other (or go from one to the other), but don't just slap them together. It doesn't work.