I love the Cthulian design of the magical girl and her powers. The overall concept of her flying around the city and doing battle was great! I would enjoy knowing more about the character... maybe a little intro story to explain what's happening.
I ended up playing the latest version, since that had WASD controls by default. One of my favorite aspects was the destructable city. I didn't realize that this made the enemies stronger, so I'll admit I did a bunch of damage on purpose just because it was satisfying to see them break.
The basic combat works, but unfortunately doesn't have the same satisfaction that smashing a building does. I think it needs a little more "juice"... made better sound effects, visual feedback for hitting and destroying enemies, basically something that makes hitting the enemies as fun as hitting the buildings. The controls also land in the "it works" category. They're fine, but flying on it's own isn't super fun.
I think overall, this is a really great idea, and a solid prototype as it stands. I hope you keep working on it!