Thanks for the awesome game, here are some of my ideas to improve it for the devs -
1. Make it so you can name your heroes, elites, even regiments of normal units. At the moment you can name your armies, but the character limit is only twelve letters, including spaces, so I can't even type in "Royal Dragons" and get it. (that's just an example) so increase the character limit at least to 15.
2. Banner color customization for each city, displayed all over your walls and also on your troops.
3. Change your main heroes' looks, armor appearance, maybe even face, hair, height and skin color.
4. Hero mounts.
4. Make it so more units upgrade their appearance to represent wealth/growth.
5. New monsters and troop choices. Giants, minotaurs, griffons, trolls, barbarians/vikings, etc
6. Make it so you can see other people's cities on the map.
7. Ship battles over sea.