I'd like to post some experiences from my recent game which might help improving the game.
Calvinus, you implemented those arrows on the upper left corner to switch countries. This is very nice although the arrows could be a little bigger. Could you provide similar switching of countries for other screens as well? One thing would be recruiting, for example. Maybe small flags like with the war plan choice or the arrows like in the main screen. That would be a nice improvement, because you know, when you think about troops, you want to think about troops for all countries.
Next thing I noticed is merging troops. Finally I found the trick how to do this. The problem is that when grabbing some corps or army the military glove clenches a fist, but I have the feeling that the merging target is calculated as if the finger was still pointing. When I want to merge troops, I drop them a bit to the right and a bit to the bottom of the base of the troop model - that works perfectly. However, when I started playing this game, it was almost impossible to merge troops and that doesn't enhance fun at playing the game, I can tell you.
I'll find more stuff, and other people are welcome to add ideas and comments as well, of course.