Yeah, I never really tested "balancing" for any of the difficulties, just wanted to get something mostly functional & unbroken for the jam. I'll need to figure out more balancing later down the line.
Having the single-target attacks target random enemies was meant to be an intentional choice, I thought it would use up precious time during fights trying to strategize and figure out who should get attacked, and it would be easier for players if they just kept throwing out cards as fast as possible. However, I'll try a build where you do have to target enemies later down the line, see how people like that.
Not sure about the bugs about returning cards & healing after a fight, I'll have to look into those. Sorry about that!
Yeah, it sounds like being able to remove/sell reward cards after a fight is a common criticism, I'll be sure to implement something to fix that in the near future.
Thanks for checking out my game!