Feedback for the jam: awesome job, making a card game in a jam is super risky because balancing in such a short time is so complicated. I love how simple and easy to understand the mechanics are, choosing to do a small length duel was a great choice. Next time try to make a web build this way its easier for us to test without having to download and a lot of people get scared with the "ArE yOu SuRe YoU WaNt tO ruN tHaT...." bullshit windows throw at us
Feedback if you are going to keep working on it: for quality of life first thing is allowing people to resize the window and fixing the text overflow in the canvas: at times is hard to read because of the lack of contrast with the background. You can upgrade the level to leave the chests to be open only after doing some duels, this way it will feel more rewarding.