Hey thaniel, very cool looking game, but I'm so lost... The turns move so quickly, I don't have any chance to see what each individual card does. My suggestion here would be to by default, advance your turn on a button press. So press Z, then the actor does the next thing they're scheduled to do. There could also be a fast forward button that automatically plays the turn like it does now. This way you could stop and see what each card has done.
I was also very confused as to why I was taking damage. This is part of the problem above, but I noticed that during my turn I was taking damage... somehow? I wasn't going off the board, does one of the starting items hurt you instead of opponent?
Perhaps you could also include more info for the player to learn ingame? Maybe when hovering over an item in the inventory, it could highlight the spots you could end up in? Or maybe you could give a short text description of what each card does? One thing that would be particularly helpful would be allowing you to hover over different symbols in the game to get a description of what it means.