My main goal for this game was to capture the same sort of feel as Total War, so I'm happy another fan found some enjoyment in it!
The map is definitely the most undercooked part of the game, more detail or at least different textures would be much better. There are lots of trees, but off in the distance since they're just sprites. The game could chug at points even on my machine so I didn't wanna put too much detail into the background. But you're right about perhaps having some dirt, or rocky ground textures to break up the endless green grass texture.
I did purposefully omit objects that were not part of the ground itself though, as you may be aware as a fan of the Total War franchise, things like rocks and trees can really screw with unit pathfinding. And if its an issue for a big studio with years of experience it's absolutely gonna be an issue for me doing something by myself in a week. It would be neat to try out objects in the terrain in the future with this project, but I simply didn't want to risk anything that could really break the game.
The UI could definitely use sprucing up, but I intentionally left it minimalist to avoid cluttering up the screen. And I did look at free UI packs, but none of the ones I looked at really seemed to capture the feel of what I would have liked to have. So I just left it as default Unity UI look. And I do realize that it still has issues with confusing people even at a minimalist level, but I think the issue could have been exacerbated if I tried to make it closer to something like Warhammer 2 or Three Kingdoms.
Thanks for playing and for the feedback!