What a good game! Crazy how much you brought into the game. Where can I start...
The UI looks very clean! All the icons you added, the tooltips, the layout. Really well done. Also the cards spread out in the hand and the darker background on the bottom of the cards with the white icons, I dig it. And also beautiful screenshots/icons for the buildings to place. A Small thing I noticed, maybe tween the cards when hovering instead of instantly popping them up, and also not removing them from the hand when clicking on them and showing them bigger.
The controls feel very natural. The Camera Controller is really well implemented, especially the middle mouse button rotation around a focus point.
Next I love the polish on the map, where it turns from gray to landscape. Wow what an effect. Generally the contrast of the gray grid and the playing field surrounded by walls, I like it. And all the game assets are neat.
Lastly, the music. Great choice, very atmospheric and fits well.
Overall great game, incredible that it was created in a game jam.