Great game concept! The graphics and music are top-notch, and the interface is clear.
For a post-jam version, I think attack animations would make the battles more dynamic and provide additional feedback to the player.
Also, I'm a poor player and would have liked a healing spell to compensate for my opponent's superiority in terms of health and abilities (dodge, poison that lasts for 2 turns, etc.).
I'm really impressed by the art direction :-)