Hey really cool idea and concept! I didn't completely understand it the first game until I had pretty much lost, but it's a neat idea to have to sacrifice your armies in order to try to find where the leader is at. I was able to win my second game! Though the overmind was in the first army that attacked us so somewhat lucky for me.
I was a little confused by the overpowering thing and didn't realize you just click and drag it to the army once your ready. Not sure if there's a way to pop that out? I did only skim the instructions so maybe it was more detailed there.
Overall though very nice! I could see this getting expanded into a much larger game and battle system.