The aesthetics here are very well executed, well done there!
I must admit, I don't really understand the game, even reading the instructions a couple of times. I just kind of went into it and hoped I would figure it out, but then the enemy just kept winning. It was a bit odd and unintuitive. I think others have said correctly that a show-don't-tell approach would have worked best here.
One other suggestion might be to have a turn based mode rather than a timer. I like the timer as a stress-mode but when you are working on a puzzle/strategy game, I don't know if the timer is necessary.
Still, congratulations on submitting to your first game jam! As far as I could tell, the experience was bug free for me and the idea was well executed. Great work!