A lot of great work! I love to see how your game progresses! Keep it up!
I know majority of things might be WiP but some feedback and ideas. I might be repeating myself with some things, sorry for that. Also, some of the ideas are for a distant future, but still...
I absolutely agree about the UI. It's WiP, so it needs work.
Those circles under your people and enemies - after you used one guy already there should be some sort of indicator instead of just green circle. Lets say a green circle with check mark. ✓
About the portraits - these are a great I think, giving your boys (and possibly girls in the future, lol) more character. What I don't like are the portraits with helmet. Lets say that you have 4-5 knights in your company, and you couldn't tell which one is Adalbrecht and which one is Adolf without clicking on 'em. It's cool on some kind of mercenaries, unnamed bandits or monsters (provided that you could see their icons in any case) but you also should feel that emotional bond with people in your ranks. Personally I think that face should distinguish those guys to the point where you could say "Ok, this is definitely Adalbrecht"
Ofc it's WiP, but I'm curious what are your feelings about it.
Weapon and armor stat ranges (So, eg. one "blue" claymore can be like +80 might, and the other +83 - lets say +/-5 range) as an incensive for "exchanging" poor craftsmanship for a better one(inside the one tier)
And I'm not talking only about "legendary" items like in Battle Brothers. You should be able to buy cheap but worse platemail, and also great set of it at much bigger price. Then comes the other tiers, ancestral/legendaries etc.
Other then that, I love the progression of helmets you have shown in first video(Altough, I'd add one more tier with rusty, terrible looking metal surface and something with leather/padded helmet underneath) - Or just add them as variety in the same tier with difference in stats.
Ability to have your own player character as a combatant. Building such system from the grounds up should be helpful with later developement, as you won't have to change events etc. at later date because of introducing that option. It wasn't an option in Battle Brothers, unfortunately (while it was in Jagged Alliance2) and a lot of people asked about it. Ofc you could have changed the looks of your lads and their names, but some people wanted to also pick their background(or write one), stats et cetera.
Modding! I'm absolutely sure you remember about that and that you're thinking about it in advance 8) Don't underestimate it! It might also become a chore if you won't take on that early enough.
different types of food, giving small modificators to your lads (eg. venison improving might, some type of alcohol improving morale, fancy stuff working better on few other stats and... risky, rotting stuff lowering your overall condition but keeping your guys fed, grain etc.)
System should react to the type of food you're using at certain times. Lets say that your guys were eatingy lavishly for few weeks now, and suddenly you're forcing grain diet on them. I wouldn't expect happy faces in your company for a while after such drastic change. That would definitely improve "management" side of gameplay in a way.
Looking forward to the demo!
Keep it up Bantichai!
Another batch of feedback and loose ideas coming in next few weeks!