Evolution is a Indie, Simulation, Free to Play PC game, developed by Alex Williams, available on Steam and published by Grubby Monster Games.
Evolution is a real time simulation of the evolutionary process. Creatures have DNA that defines their structure, traits, how they see the world around them, and how they react to it. Each creature is unique, most die quickly, some die a little slower, and others survive (some just like rocks, they usually die too).