Very well.
As a madness based animation, it is very well made.
I found some flaws though (as in any possible flash or art piece ever made), but again, they are from my personal point of view.
Ignoring the obvious references to certain anime series (which not are flaws but your personal taste) I found it sometimes to be somewhat cliché and predictable (like when I saw that there was a female bunny this time, thus opening the chance for a love affair in the middle of the slaughter).
The main flaw in this flash was in the point where the female bunny sacrificed herself to save Snowball (I'll assume that her mission was so important that she saw she couldn't kill the "bad guy" by her own hands and thought he would stand a better chance and not because she loved him). Allright, far enough, but then Snowball entered in a rage/supersaiyan state (yet again, pretty predictable from the moment the female bunny died), why exactly? because his new found ally was killed? because she blown him a kiss? because she had boobs? pretty unreasonable for a "killing machine" to have such feelings over someone he met just 5 minutes ago.
Again that could have been avoided if they knew eachoter before and they attacked each other on instinct during the killing, I'll watch the last part again to check if there's anything on the credits, hold on.
Well nope, but found of that the female bunny's name is Ruby, yay.
Another one, if the "bad guy" or Flint could spawn any weapons he wanted, why was he literally crawling over the floor to pick his sword up?
Well that would be all, hope that you don't take this review in the wrong way, it's a good flash, but there are certain details that cause problems in the storytelling. Hope to see your future works, keep em' coming!