Wow, I'm in love with this idea. Was this inspired by Luck Be A Landlord? I took inspiration from that idea myself for a previous gamejam (Escaping Winter, if you're interested). One thing that really would've made this game pop would've been to add store upgrades. As it is, you quickly end up in a situation where you have a ton of gold, because it's only used for rerolls. Making gold required to upgrade the store (and allowing you to get better cards) would've added a fun risk/reward aspect.
Obviously, in a gamejam, your scope is limited, but I honestly think this could be a fun $5-10 Steam game if you add store upgrades, some more content and polish, etc. And honestly, hit me up if you want to discuss ideas, because this kind of game is exactly up my wheelhouse, haha