Great game! I think we have stumbled onto the same theme of enemy design! I assume the enemies are decks of cards and coins?
I did find some issues that you might want to be aware of. First is that shots aimed downwards still send the visible projectile upwards. Still damages the enemies though so no biggie. It is also possible for both the players and the enemies to roll/jump into and get stuck at the edge of the map.
This being said, it is a truly well put together game. Well done!