Thanks for playing and exploring the mechanics. Increasing the attack certainly doesn't do anything other than wasting a turn. It should be able to overflow into a heal, though I don't think I've properly tested that part of the mechanics, so I'm not sure if it still works. It might be nice for the player to attack automatically like the enemies, but I realized it a little to close to the deadline.

Thanks for the feedback. Currently, there is not really an advantage of player having high attack, which I think is a missed opportunity by me. To damage the enemies, you can actually utilize the attack up cards to increase their attacks, and then use self-destruct to deal more damage to them. You can also use the heal cards to make the enemies' health overflow.

Thanks for playing! Balancing your own health is one of the mechanics that I've focused on. This allowed me to be lazy about when deciding what enemy spawns since both enemy types can potentially kill the player.