Great job, move on.
Krinkels, I've gotta hand it to you. You've done a great job with the madness series. You say you're a one trick horse, but you're not. You've done flash animations outside the madness series before so why not try it again?
Okay, now onto the review:
Style:
The madness style is your trademark and it's great... simplistic yet filled with intricacies that make the video high quality. I like what you did with this animation. It's more dynamic and you still stick to your old style strengths.
Graphics:
You did a good job with this too but I'd say that you took a few too many noticable shortcuts. It's noticable that you used tweening for some parts and it just looks incorrect. A good thing is that the frame rate isn't raping my laptop for a change. I think it's due to your "bullet time" usage. The zombie details are the same as last time I noticed. The clown is more dynamic. The reborn characters are a lot cooler. Not much more to say really, it's more of the same stuff with a tweak here and there.
Sound:
Here is where it kills you. The sounds just pissed me off. Some of the gun sounds are horrible and I think you should find new ones/redo them. The music is a good match and synch is great but just the sound effects are out of place. The uzi sounds and some of the hits just don't sound right.
Overall:
Just move on man, you've basically brought the madness series to its peak. Just let it be game over. Start another project, I'm sure you'll find something else just as fun.