I played a version like 1 year ago? It was already quite fun even though there was not a lot of content.
A couple friends bought it recently, there is lots more things to do and the social interactions possibilities are numerous.
This game is Prison Architect mixed with Dwarf Fortress, short.
Its way less complex than Dwarf Fortress though, I loved trying to learn this game but it is so hard that I quit, where I was able to play and learn RimWorld quite fast, even though the learning curve is steep its way more intuitive and visually pleasant. Buy this if you like any of the games I mentionned, bonus points if you have a boner for spatial colonies and science fiction.