I'll make a list.
-Add a good background
-Add music of some kind
-More realistic movement
That should cover it.
not the greatest but not too bad
not the best somewhat funny but still kinda you know weird
Get a good background and add a story, maybe or something beside just simple killing of all the madness characters. And you'll be getting fives in no time. I gave this a a 2, but I do think you have a lot of potential, your just need a little more work on animation and such.
Overall not bad.
That was cool I'm makeing my own madness flash at the moment, were did you get those wepons and charcters from?