Quality of art in this game is close the quality of Slay the Spire's art which i think is the main inspiration for this game although i may be wrong. There are some problems with UI, UX and lack of sound is a bummer.
I haven't play Slay the Spire or similar games of the same genre but i think card battle system is well implemented, it works smoothly. The implementation of card exchanging mechanic is also good and it's an excellent way of using the theme of the jam.
Visual design of bosses look good but they lack variety in their combat behaviour. They all have the same attacks. No weaknesses, no unique cards etc. They just look different. If i didn't miss anything or escaped my attention.
Overall a pretty solid game which need some more work on some areas. Well done and good luck on your projects!