Ahhh panic mode! I played on easy the first time and won, so I thought I'd skip medium and jump straight to hard. It was too much for me! I'm not sure what a good strategy is. Since I'm always busy rushing around with items I don't get to watch how the combat is progressing. Maybe I needed more archers or maybe I was putting out too many archers compared to the other two units. All I know is I usually had a lot more ore than wood, and had little time to chop the trees!
It's very well done, everything works perfectly as intended as far as I can tell. :)