The real power of magical girls is the hope they create in your heart ^^ or something like that
I know the mouse is capable to 1vALL even the final boss, I didn't get time to ponder balance much with this system. But I'm realising more and more things about it that will help me do a better job next time. And as you said, the game was fun anyway, so it didn't bother me all that much this time. Balance in one player experience is overrated anyway
As for the themes, I knew right off the bat it was the Madoka Magica series, but what can I say? The idea literally imposed itself to me after reading "the magical girl can be anything", and I am the kind of person that just gets swayed by inspiration when it's here. I hope this isn't too much of a problem...
I guess staying in the theme was compromised as soon as I thought "I want to make something innocent and uplifting, unlike what Madoka made of magical girls" anyway... >.> (Madoka's great, but kind of heavy I mean)