It was fun to see my solar system grow, but after Orbit Bonus on Click Level 10 they felt more like debris in a hurricane than planets. The click bonuses waaaay out strip the automatic rotation and orbit speed, to the point that I didn't bother messing with automatic stuff for new planets. I could see this developed into a game where each planet has its own attributes and bonuses, or get special perks if they're aligned with each other in orbit.