I based my story on the evolutionary tree of life.The prototype is here.
You can choose an animal to begin as, and go back in time to actually become other beings you are distantly related to.
I’m inspired by the game Everything by David OReilly. In this simulation game, you start out as one animal and become others. You can become animals smaller or larger than you (in contrast to mine, in which you change animals based on evolutionary connections). I really love this game because it focuses on a non-human story.
In the future, I would like the story structure to be more complex, in which you get rerouted to be able to become one of the other original animals you could have chosen from.
My thanks to the Open Tree of Life site, which is the first accurate & complete evolutionary tree on the web.