Comments:
-You should make a new unit called the machine gunner (since they were one of the most important defensive infantry in the war).
-Also, make sure to make trench graphics.
-Are you making the infantry have the bombard ability (throw gas ability) or are you making a separate unit?
-You should make infantry very cheap, since in WWI, all active countries were mostly churning out infantry.
-Maybe you should make a unit called field medic (although kind of expensive), and they act as mobile cities with barracks, so if units go to them and fortify where they are, they heal in 1 turn or something
I wouldn´t mind to try out the beta. BTW, when will the real game be expected to be released (can you give at least the month)?