The World is Yours!
Planets! is a 2D life simulation game for iOS and Android devices that puts the player in control of an entity called the Designer. Tasked with creating a new world, and thus create life, the players will make the calls regarding the planet’s initial characteristics, and then interacting with the virtual life that has appeared.
Game Design Document available for download below. All images were borrowed from various sources and used for descriptive purposes only.