If you're planning on expanding the game(post-jam version, or a sequel?), I'd personally suggest having more deck editing or something like that. Right now, both opponents seem to have identical decks, and even though draw and discard piles are shown, they don't seem to be effective since I doubt that any player will be seriously tracking remaining cards, or deciding on a strategy based on them. It would be quite cool if, for example, after winning a battle, you get to add some cards to your deck, change around the card counts etc.