RimWorld has expanded in a massive way with the Odyssey expansion and the 1.6 update, now available for all players.
This is the fifth expansion to the hit sci-fi colony building sim. Pushing beyond a single map to allow your colonists to build a flying home and travel across the planet and even into space. With new biomes that introduce diverse landmarks and exotic wildlife, and dynamic quests include hunting alpha thrumbos and raiding ancient cryosleep bunker. And when you're done on land you can head into space where you'll find space stations, asteroids and something stirring in the dark.

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“The game has always created a whole world beyond the colony, but it was hard to get out there and actually explore it,” said Tynan Sylvester, founder of Ludeon Studios. “Turning the whole colony into a giant movable ship unlocks all that latent story potential. And once we did that I figured hell, why not go to orbit as well?”
With the new biomes there's distinct hazards and new opportunities, along with a new landmarks system that transforms the world generation. Giving you many new options to build colonies, there's also a lot of new animal species to find, fishing mechanics were added, multi-part story quests and then list of what's new goes on and on. With all of it coming to a new late-game threat with the machine hive mind.
The expansion also includes a whole new album from Alistair Lindsay, composer of the RimWorld soundtrack.
Although this is not for me, really: I do NOT like this type of graphics...

(Now let me go back to my beloved Songs of Syx...

But really, this is probably one of my all time favorite games. Literally the only thing I would buy on release day (and did, lol)
@Boldos - yeah, the graphics are a bit funky (plus like 10-12+ years old, lol). I'd still recommend giving it a chance. Turns out the art choice makes for a fairly easy to read map, and I think the cartoony nature really balances out some of the darker moments (kinda like Kerbal Space Program's Kerbals) although that's probably more personal preference.