Cool game, I really enjoyed it! I understood the idea by round 2 and made it up to round 9. I wasn’t sure if the health bars were duplicated or if that was a stylistic choice but it got a bit confusing at times as I thought the enemies had double the health they actually did.
During one of my runs, the game got stuck on wave 3 after a "Cannon" enemy killed one of the "Unnamed" ones with a tail. It also froze at wave 5 when a plane killed another "Unnamed" with a tail (this happened on two separate runs), and again at wave 9 when a tailed enemy killed a "Hooligan." That was a bit frustrating.
I think it would be great to have the option to go back when selecting a card to add to your deck.
I’m also not sure what the symbols in the top left corner mean. I thought they showed the number of cards I’d receive next turn, but at one point it showed just one square, yet I got like four.
Overall, an awesome, simple, and effective game. Congratulations!