This was the Bachelor Thesis I worked on, here is the abstract: 

In this work we show a way to use interactive evolution to create desirable worlds with virtual world generating Swarm Grammars (vSG). We present the effectiveness of the evolution process at two examples. We also try to combine the two vSGs we evolved, but this does produce unexpected and undesirable results and shows the need for future work if world generation is to be truly made effective

The project on Github: https://github.com/Tinsa-tech/BachelorArbeit