I wish I was better at this kind of game, but this doesn't mean I didn't enjoy myself playing it !
I love what you did with the theme, love the music and the visuals. Really like everything you did ! One thing I wasn't a fan of were the controls, maybe I should've tried switching up because you're giving us a few possibilities but I stuck with Z/X/C, I kept mixing up the keys and being bad and dying, BUT this is not my genre or predilection so it might also be on me !
Anyways, really great idea and great execution, and I forgot about this but I like the fact that the new spells come first in the "next spells" list, it makes you think wether you should recharge now or after emptying your magazine