This looks interesting. I'm thinking of making something like this myself, just 'cause I want to play it and it hasn't been made yet. Definitely keeping a eye on this.
I love the idea of starting your own empire, and multiple characters in the same persistent world. You could RP to yourself, like, Character 1 starts a empire (pirates), takes over several star systems, and passes his empire on to a NPC/gets killed in action. There would be a Simulate option, where you could tell the game to just simulate for a couple of months, so that you could found a empire, take over a couple of stars, then 'accidently' get yourself killed, Simulate a bit and watch the result of this empire -- would it be taken over by a NPC, would it pull itself together, or would it disintegrate? Suppose, after your character was dead, a NPC managed to take the reins and you watched as your old empire began to expand. Then take a character, and re enter the story, maybe on the other side of the conflict as your old empire begins to expand. You could fight against it, maybe even try to take it over, et cetera.......
TL;DR: In depth sandbox simulation of a futuristic sci fi space civilization = good stuff.