A deploy all soldiers button would be great. Also, to stop the game from being too idle, you could make the "defend your keep section" a side scroller type thing in which your soldiers can keep moving right to battle enemies etc
I was really exited when I saw this sequel, five years later, but honestly I liked the first a lot better. The motion and controls just feel off in this, and I preferred the graphics before being much more minimalistic. This sequel had a lot to live up to, but it just doesn't feel right.
This game rivals Cookie Clicker. I would add more specifics to the pickaxes, instead of just having them be randomly crafted by gems. Like, you mine materials, which you can use to make better and better pickaxes.