MOST of the games in the Arcen lineup are in the same sci-fi universe. The exceptions are Tidalis, Shattered Haven, Skyward Collapse, and the two Valley games.
Chronologically we get:
1. Bionic Dues -- sometime in our future, but not too far off. Corporations own whole cities, robots are rising up, etc. But the robots largely suck and are not organized.
2. In Case Of Emergency, Release Raptor (this game) -- a bit further on in the future after Bionic Dues, but only a couple of hundred years at most.
-- Human civil war starts in earnest --
3. Untitled 3D Survival Game -- this one takes place a few hundred years later, on an "earth" that is not our real earth. Or rather, it's not Earth Prime.
4. Exodus of the Machine (cancelled) -- this would have been a few hundred years after this game.
-- Then there's an even bigger human civil war, and the war with the AI, and humanity is all but wiped out --
5. AI War -- 800 years after that, here comes our first game.
-- millions of years pass --
6. Stars Beyond Reach -- no comment just yet, it's complicated.
-- a lot more time --
7. The Last Federation -- but wait, I thought this was supposed to be before SBR? How else does this timeline make sense? No comment yet.
-- a lot more time --
8. Starward Rogue -- the Last Hydral is way off in space on his own.
Anyhow, there is backstory as well as sidestory in a number of the games that stretches between those time periods a bit more, and which answers a lot of questions. The big one that answers TONS of questions and ties everything together... is Stars Beyond Reach. Here's hoping that properly happens!