It's really a good game, but here is some suggestions:
First, could some of the passive skills re-trainable? Second, could we sell the items that can't be used (Blueprints and armor). Third, could the drop amount of souls increase (Ex: Increase the amount of one for each time we finish the game)? Forth, could all the troops that take part in the war movable? Fifth, could the effect of "City" increase?