Thanks for the feedback! On the final night before submission, I got a lot of comments about effect triggers being unclear. I only had time to add token highlights when they're tied to cards. Originally there were more upgrades and curses, but without time to balance them properly, I had to cut that content for now—saving it for the Steam version.
Right now, I'm planning to organize upgrades/curses into 'packs' like in tabletop games (think Runebound), аnd the batch uses several packs. This keeps mechanics from feeling overwhelming while letting pack combinations create tons of variety.