Completed it in hard mode. I think it's time we talk. Needs more levels and maybe more kinds of power-ups? I'm thinking weapons. You have sunny-day, have a de-buff called cloudy day which you can send with each army from the cloud that has it. It would halt production for the hit cloud.
Just a thought.
 "The Programmer RPG"){kind=icon}
 "Riddle Odyssey 2"){kind=icon}
 "Cloud Wars - Sunny Day"){kind=icon}