Fantastic submission! I am really impressed with the smooth game mechanics and how polished the game feels. The concept is easy to understand and very playable. I thought the difficulty curve was great, nice job on balancing.
I ran into just one bug! But it was awesome haha, I found that if you get the Bomb card, since it take 0 energy to use I can just spam it until all enemies are dead haha. I would probably make it cost some energy or give it a limit like the Wait card.
All in all, really awesome game and I hope you continue development :)