Of course, I played it. I always play on the maximum difficulty; the others are not interesting to me. :)
By the way, this mission is actually quite good at the beginning. I only completed it on the third try; I had more problems with the brown faction than with the turquoise one.
At first, I wandered around for two weeks without capturing the first Castle, so that the yellow faction would build it, because I didn't have enough resources. Then, I took it when it was almost fully built. And when the brown faction came with a large army, I destroyed its catapult with my archers, and all its ground troops could no longer reach me. The same thing happened in the first battle with the turquoise faction.
(On the sixth week, she was level 18, attack - 22, defense - 10, mana - 120). I defeated the brown faction in auto-battle with almost no losses; the turquoise faction didn't even try to attack this time. Maybe the creators mixed up the difficulty levels?