I... am little confused, instructions say you need to hold space to reload and same in the game, but really I had to do the opposite - hold space to get out and shoot?..
I'd wish there was some effect when enemy actually hit, instead of shoot having same sound and visuals if you shoot space or invulnerable boss (There are invulns between spellcards, right?) and arcade white flash would be better turned off by default, especially as it plays in menus too, you mentioned it, so hope for good.
Spells from boss herself feels great, they really hit you if you greedy and require parttern memorisation for putting the most into fight.