Honest question: do you plan on doing this "big"? I was doing some illustrations and some sketch texts for a magical girls Borg game, but if you were gonna already I wouldn't want to step there ;)
Honest Answer: I was considering it, and writing up some notes on how I could expand the rules. Magical Girls are a diverse genre with wildly different concepts between shows. Maybe we could coordinate our projects so we don't overlap? I don't want to stop someone from making a cool thing because I'm making a similar thing. Can I DM you somewhere? I'm "Blasted Tower Games" on facebook.
BTW: Your collage art style really gives me some Madoka Magica vibes. I could definitely see it working for a Magical Girl game.