I really loved checking out this game! Like some other comments, I unfortunately ran into a few bugs and also found the game pretty unintuitive at first; while the art is really nice, I think a clearer UI and tutorial system might have been helpful. The mechanics also felt a little incomplete; I really liked the idea of the card trader shop you mentioned in another part of this comment section!
All of that said, it's really hard to scope and polish a game in such a short amount of time, and putting a game this ambitious out the door in four days as a solo developer is an incredibly impressive feat within itself. I'm very excited to see your work on future projects!