You have to balance your planet by putting new buildings into it.
Balancing is tough to get as its hard to get it right as there isn't a more accurate instrument to keep it rotating properly.
I like the idea and the concept but i find it though to manage.
I had to give it some tries to get the 2nd level right. And the 3rd level i still havent managed to complete after some tries.

Other than the bit hard difficulty, the game seems ok and plays well.