I like what you're going for here. It reminds me of Into the Breach which is a fantastic game. Unfortunately, I wasn't able to figure out how to move or attack. Maybe you could add some instructions/controls to the description of the game? If you do, let me know, because I'd love to give this game a try.
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Yes, you are totally right! that was exactly the game I was playing when the Jam started! Thanks for the feedback, I have not thought about explaining the main game mechanics with the cards and it is true that it is not that straightforward. I have added a brief description in the itch game page and some screenshots with hints for clearing some levels. Hope this helps!