I'm not very skilled at roguelikes, so I had trouble beating the boss enemies, but I still had fun learning the mechanics of the game! I think the idea of using a rotating revolver drum is very creative for a deck builder, and the gameplay feels relatively fast paced like a duel would be. It's incredible what your team was able to accomplish in just a few days!
Although I found the tutorial helpful, I think it would be more beneficial for a player to go through one round while explaining what all of the effects do as you go.