This game is exactly my favorite type of thing, you've put together a very cool roguelike system and the deckbuilding you have is very fun. Combine that with great visual consistency, witty names for cards, and the ability to do it all within 9 days for your first jam? You've got a recipe for success, amazing work!
Some cards do need some balancing, bean water is too good, primarily for the fact it has permanent scaling and it provides time (something you need to be really careful about providing the player in this sort of game). I would still be playing the card if it said "Reduce reward by 50%. +1 time. 0 Nut Cost" which I think speaks volumes to how good it is.
Also, ran into a few bugs during my playthrough that led to crashes, I've assembled them into a document here for you!
https://docs.google.com/document/d/1SKMYxNYQpm_VljoxvAGMrLjem7uSZQNb_U7lhZmS86I/...
Again, great work, and good luck in your future endeavors!