Hi there! I just finished a playable version of YAES/S, Yet Another Evolution Simulator/Sandbox.

The game is a sandbox wherein you can gently guide the evolution of a bunch of square Creatures, whose behaviour is controlled by Neural Networks. These neural networks mutate over generations, producing (hopefully) smarter creatures each time! 

A screenshot:

Play it here:

https://mysteriousdeveloper.itch.io/yaess

I hope you enjoy!