It’s not Minecraft, that’s for sure. However, the players can work on portable achievements such as their ship, their gun, the amount of currency they have, their discoveries, etc. The exact fiction of “building an empire” won’t be there, but accomplishing things in a vacuum will certainly be part of the gameplay. Leaving comments about their accomplishments for others to find will probably appeal to a segment of that group.
There’s also this, from an interview back in September 2014:
So as players make their way closer into the centre of the galaxy, will they encounter other players more often – with bigger ships and better guns, all waiting to blast them to space dust? Perhaps, Sean explains: “If other players aren’t doing that, then there are NPCs who will. But even at the centre of the galaxy, everything is still massively spread out. We want to make something that’s vast – we want it to be like the Wild West, where you never know what’s over the horizon.”
I don’t know if they’re trying to do this, but imagine this game with MMO infrastructure behind it. In the first six months, the game is essentially a single player game because players are spread out so much. After that, the game progressively starts to turn into a multiplayer game, with players bumping into each other more and more often. In time, they start to travel in small packs. Continue for a while and you end up with EVE Online, with factions trying to control the center of the galaxy. The ultimate prize goes to the alliance of players that can build the high tech whatsitz at the supermassive black hole at the center of the galaxy to win the game.
I find the progression from single player to massively multiplayer in a single game to be an extraordinarily-intriguing possibility.
The development of the game could even proceed in stages. The MMO infrastructure won’t be needed for a couple years because it will take that long for more than 100 players to get into the same system.
It may be that’s why Sean keeps answering questions in such a screwy way. He’s trying to avoid giving away some pretty important stuff about the way the game plays out. It might also explain why the solo gameplay is so simple; they want to build on it as players start to interact with each other.