Interesting mechanic and the presentation is great. It would be cool tough if the camera was a bit more zoomed out and the map was larger so that we can react more easily to enemies. Also, I think when you hover over the card with the mouse it pops up too much and it takes too large portion of the screen.
Other then those two things the game is great. Well done!
If you're interested, check out my game: https://itch.io/jam/gmtk-2019/rate/461829