I liked UG Gettysburg. However, I don't think it was amazing. I felt it was more like a simplistic mobile game than a serious strategy game. My main two problems with it were bad readability (mostly visual) and over-abstraction of some mechanics like "condition" for example. In my opinion different things like fatigue, ammunition, morale, etc should not be arbitrarily combined into one highly abstracted mechanic. I hope UG Civil War separates these things into their own entities.
Also, reading the terrain for things like obstacles and height was extremely difficult. I usually gave up on trying to position cannon correctly for example. I hope that UG Civil War has a much more clear and "readable" terrain. I would like to see color coded and icon based map overlays for things like height, terrain type (corn field, grass, marsh, forest), obstacles, etc that makes clear the bonuses and penalties.
Another thing I think would benefit the game is a "timed execution" option for orders. I think the player should be able to give different units different orders and have them execute at the same time or in a specific order and timing.