Dude, the game is really addictive. You clearly thought everything through in a very consistent way. I managed to create a pretty crowded situation, and there was even villager production from houses.
However, there seems to be something that causes units to run in place sometimes. It is not only friendly units; enemy builders and other units also get stuck like that from time to time. While playing, I had a guess about the reason, but I forgot it.
Also, instead of showing the descriptions by holding right click on the card, it would be more practical if they appeared when hovering the mouse over the card.
The game is honestly both challenging and full of opportunities. I would love to work on something with you someday :D