You nailed the main thing I'm working on. Right now it's just "hit the number" each round, but I'm building customer types that change the rules per round: conditions on what's consumed, underfeed/overfeed punish/reward variations. These might be the gimmicks you were searching for. Relics are on the list.
Feast UI and duplicate shop tiles (agreed they feel bad) noted as well.
I'll drop a comment here when the update's live if you want to revisit!
