I like the idea of selling the equipment and bonuses to the heros and villains to influence the battle. Unfortunately I did not really understand how the battles where going. Would maybe have helped if there was a overal progress bar for either team.
Viewing post in ShopKeep jam comments
Because I already had my hands full time-wise most of the AI is really dumb, they buy whatever they can (not a repeat of an item they have, they can afford it, not full on items) randomly after they respawn as they move out onto the field until they can't anymore. I'm thinking of expanding this with different roles for characters that prefer certain items and also adding magic, physical, healing aura, etc items to match.