Shoujo FamiFighter (Localized name: Adorable Entertainment System Showdown)

[E-Man]

Seems good so far, but I think the graphics for the buttons, D-Pad, heart, and the fist could use some work work. Not only would they benefit from better shading, but also the outlines are very jagged. Also, I'm trying to decide if a pattern of sorts in the background for the the character select screen would make it look better or not. Still, since you did say that those are mockups, I don't know for certain if you already know all that or not.

Anyway, the concept is very interesting. Out of curiosity, is that Mama from Doki Doki Panic that I spy?