Thank you a lot !!
If there's a unit that felt more interesting/fun above the others, which was it for you?
For me it was the runners! I was spamming click on rock, so during all game, and even when I had everything maxed, I had extra ore that was not being carried. Maybe instead of getting a chest with a fixed item every X damage to the rock, you could give the option to choose between 3 different ones, so each player could pick first the utility they'd use the most!