Sadly, game has numerous problems with UI. It looks like it was developed with Full HD and higher resolutions, this collides with overall retro feel.
My review is based on demo version 2.0.5.
There is a bug with UI scale - when I set it to something different than 100% then button collisions have wrong offsets so I was forced to this setting, this is real joke. Also I have to click button one click after another to change UI scale by... 1%. Long button press doesn't work, painful.
Lexicon doesn't scale at all!
I play at 1280x1024 resolution, with UI scale 100% text is nearly unreadable, even with smooth option on. Small status icons also. Lexicon is one big pulp. I can build right buildings in city only because tooltips have bigger font. Upper status bar on battle screen is unreadable. Number of units blends together with unit portraits. There are many more annoying oddities but I don't want to make huge comment.
Every well done feature like amount of units, cities, map objects, unique mechanics and much more is nullified by cons which I wrote earlier.
I wouldn't pay full price for the game until UI will be seriously revamped.