8 for the animation.
Alright, I'll give it a solid 8 for animation. You lost two points for a simple reason.
In all the collabs that I have seen, none of them have a story that flows at all. It's just a theme, and then random thoughts based on that theme.
It would be better if say, everyone in the collab got a certain part of the story, like a certain long hallway, an open street, and the alien ship. The only rules would be that the character starts the scene by moving into the area empty handed, and leaves empty handed, has similar powers or just normal human abilities, and same color.
Another idea is to have each animator have multiple characters that play actual roles in working together. Transitioning between them could be solved with just some sort of phones and a few quick lines of text, or a task bar, which gets crossed out as each animator has a character finishing that task. Driving enemies out of the city, preventing new ones from coming in, bringing the bomb to the enemy base/ship, etc.
So basically, I can't really tell you how to improve animation, but it could be a lot better with just a little bit of teamwork. Something as simple as having one character at the end of the scene saying "center of city is secure. How are the borders?" and having the next animator say "We're being overrun!" before getting right back into the action could really make a difference.
I just want to see collabs be more...team-effort based. It may seem so simple that it doesn't make a difference, but it does. The animation and fight scenes are good, not much to fix there.