this is absolutely amazing. Really great work. I'm strongly considering using some of these generated backgrounds for our game Barnard's Star: https://store.steampowered.com/app/1217500/Barnards_Star/
I'll be sure to give credit if we end up doing that!
Anyways, I'm just super impressed. Great that you include source too -- I'll probably take a look at some point to see how the magic happens.
I also saw one of your posts on Reddit detailing the process of generating procedural pixel art planets. Incredible stuff. Keep up the great work!