I like the idea of inverting cards but I think the range of cards is too limited and the health of opponents too high to keep the game enjoyable, maybe I just got unlucky but I found it very hard to damage my opponent more than they could heal. With all that criticism though I think with more card types and some minor rebalances this game could be very enjoyable, so I hope you release a post-jam version at some point.
Also if there was an option to turn the music off, that would be nice.