I clicked Start Incursion before I had any military units and the error message that came up was not in English even thought that is my chosen language.
I don't think it's possible to play this game. The chicken comes up about 70% of the way then falls down and you run out of energy. Also the game runs at 5fps. I've never had a game on itch run that poorly before. I'm using chrome.
It would be nice if unlocking a feature would at least give you one. Also, having my first gem show up, only to have it wiggle its way off the board was kind of disappointing.