Vector wise, this wall is freaking awesome. Respect for that. There are, however, some points I don't like about this wall.
First of all, the perspective on the right mecha seems a bit weird. It's really hard to determine how that mecha lines up with the floor, due to the tilted camera angle, illogical shadows and the dynamic pose of the mecha.
Secondly, WHERE ARE THE EFFECTS?! That's the most pathetic spark I've ever seen. Come on, those things hitting each other is supposed to be an epic battle and a giant inpact! Massive sparks! Smoke! Dramatic music!
Smoke/dust would've solved the first problem too, by the way.

Considering the amount of time you must've spent on the vector, I can understand why you wanted to upload it as fast as possible, but in my honest opinion, a bit more time on the postproduction and this wall would've been way more awesome.

Don't get me wrong, the wall is still pretty good and will be popular, but for me to fave it, that's gonna take just a bit more ;). Good luck on future projects.