Still great
The only thing I did not like was how there could have been a background. While it was never finished, it's still great to watch because it's so amazingly flashy. I guess it makes sense that a flash would be "flashy", eh? Okay, what was really cool about this collab was I think it was the first one I ever saw that had characters drawn by different people fight each other. That's a great original idea that I wish would have been utilized further! You guys look like you got pretty close to finishing it.
I suppose if you do not complete something, you might as well have most of it done to see. It was just great to see all this crazy stuff going on. I think my favorite guy would have to be the green one who threw black balls out of his mouth or something. I wish I could remember the names of everyone involved. It's still a tribute to talented animators like you guys.