I love how worldbuilding is integrated into/is an extension of play! Particularly with GM-less/GM-full games, getting everyone at the table invested in the world and the stories you will tell within that world from the very beginning is a hugely important and Space Between Stars absolutely nails this. The presentation of "Threads" also lends itself to an intuitive way to drive these GM-less/full games.
The Grief/Loyalties/Hindrances mechanics, really the whole way you can build your dice pools are really great. Not to mention, the provided resource/character sheets are slick.
Also, space is great and space games are great. Games with Space Whales even greater.
(and yeah, VICHEATYA)