Currently controls are limited. You can make the little ships explore around until they have reached every planet and consider it "discovered". This will be become far more complex in the near future.
The seed that is supplied is a good example since it seems to contain all elements of the current design procedure, nicely balanced. If you change it you will get different results.
Let me know what you think. :)
Currently, the background is "borrowed". It was for a proof of concept, so I will be adding my own background(s) soon. Until then, thank you random artist.