I have been playing this for quite some time now and its Super fun.
here are some recommendations, some of which I know your working on.
In the beginning, we need more immigrants, its VERY difficult to start off without them. I only got like 1 immigrant notification in 5 minutes, then eventually as the city grew they stopped which they in fact should only increase due to your cities noticeable "popularity".
Gatehouse graphics, under the gatehouse the arches are always dark green, you should make it so they blend in with the land under them.
Army needs MUCH more improvement as it has SO much potential with it, Select all would be nice, or click/drag to select your troops so you can select more than 1. And eventually you could make it so they wear armor or something and with that comes sort of blacksmith shop maybe.
Make cities able to Expand a larger radius, they span very minimal defaultly.
Should be able to CAPTURE other enemy cities, and be able to TRUCE/Peace/Trade/Go To War ALONGSIDE!!
Enemies I think personally should look realistic and not red aliens lol. but that's just a personal thing.
The enemy bases are very basic, they just stay basic but get larger (expand) and not actually develop themselves or upgrade themselves.
But I heavily recommend you think about the starting off of a game, its very difficult to start out.
Hope some of that is taken into consideration if not all.
P.s. this game is one of the best games I have ever played on itch.io.
Thanks,
Nate