Extremely fun and well made game, hope to see more from you. I found grinding between runs annoying, upgrades don't seem to confer as much benefit as items.
Viewing post in Attack on The Witch jam comments
I'm glad you are having fun when playing this game.
The upgrade increase the stats exponentially. So upgrading from lv.4 to lv.5 increase the stats a lot more than lv.1 to lv.2. Upgrading Attack also increases the attack gained every leveling up. Besides that, early upgrades are a lot cheaper than item.
Anyway, thanks you for playing!