https://motherboard.vice.com/en_us/article/xwj887/space-invaders-but-the-invaders-evolve-like-bacteria-genetic-algorithm

InvaderZ is a simple open-source Space Invaders clone with a complex twist: The aliens genetically evolve like bacterial.

The goal is to make the next attack stronger than the next, in a “survival of the fittest” scenario. It’s Dr. Mario meets Space Invaders, plus evolutionary math.