Alright, some feedback for now:
-Get rid of the second screen and use a similar title screen to RyouWin's.
-The "Select your heroes" avatar at the select screen seems out of whack, as it seems to be bouncing around.
-The Versus letters could've been MUCH better ripped, and you need to use the same VS theme, with the accompanying sounds.
- You need better fonts for the lifebars. The main icons should be scaled 1,1 and the partner icons should be scaled at .5,.5, or close to this screencap:
Spoiler, click to toggle visibilty
-Make any animations as fluid as possible and not jumpy.
Hope I helped.