My focus is on multiplayer game and there two points I am not fine with. Although they are mentioned already here again:
1) To resupply troops is much to easy and cheap. This means the mean idea is to eliminate troops to avoid reinforcing. The focus should be more on fighting to get better positions, than to eliminate troops.
On the other hands things should not be to complicated. I like supply lines very much, but this is a bit to much for this game. So I like the reduction of possible reinforcements by airplanes and adjacent units. To do this for troops far away would be fine and to avoid increases from strength 1 to 10 in a single round seems to be a good idea. Do not give ammo in addition to the strength, you do very seldom reammo infantry, because you reinforce them inseed.
New units should not be placed adjacent to enemy units or may be they should get supression like para troopers.
I like the idea of increasing costs for buying and reinforcing the same unit typ (except infantry) all the time to get a better mix.
2) The undo function needs to be fixed. It is fine to have an undo function, but it should not be possible to scout with it. So where is the problem to reveal all enemy units by deselecting the unit after the move. After that no undo is possible. So you cannot directly attack an enemy within fog of war. You need to move into position, deselect the unit, select it again and attack after that. This seems to be much to complicated? But you have to do it like this at the moment as well, because there could be ari behind and you will detect this just by deselecting the unit before you attack. Only the adjacent hexes are revealed, not those behind. This is hard to understand! So I do not know how many bad attacks I have launched, because I missed that
Overall this is a great multiplayer game and great balanced maps!
Best regards
Gwaylare