Oh goodness. The Touhou/Flappy Bird combo is hilarious and ingenious.
Patterns that would be really easy with normal movement from Touhou suddenly get hilariously hard.
I think the balance of the spells are pretty good once you get used to the main mechanic.
So, hard but fun and funny. Also I see what you did there for Mystia's 2nd Spellcard.
(From a dude who touched only Hard mode of this game)