Thanks for the in-depth answer! Looking forward to playing when it's further along in development :D
It was maybe a bit arrogant of me to write such a lengthy review based on a single, unfinished play-through (obviously, my misconception about the classes solves quite a few of my issues (Not a ridiculous mistake, one of them were named "paladin" :P)). Looking at the character-specific upgrades again, I also think it will solve itself automatically once the shop has more stuff I'd want (so taking cash instead doesn't feel like you're foregoing one of the limited options for a permanent upgrade). I don't think you should underestimate how much better some of the upgrades are compared to cards though! (as they don't cost power, don't take up a card slot AND goes into effect immediately), so missing out on an upgrade should pay very well!
If shield was supposed to always disappear with a single hit, I think I ran into another, tiny bug
I see your first point about the hand-limit, but I don't think the "save up cards, then unload all at once" strategy sound so bad. In my experience, the only time i could use movement to "run away from danger" was against melee-enemies on the first turn, and it requires you to somehow mitigate the damage on the turns where you aren't doing anything. Also, these "god-turns" where you just decimate the enemy and feel super clever and powerful can be kind of fun. You obviously know the systems wayyy better than me though, so if you think it would break the game, you're probably right ;)
Rooting for you, good luck!