Build a spaceship, look after your crew and travel the stars in Space Haven as it's now available in Early Access and it's good.
The developer, Bugbyte, ran a successful Kickstarter campaign little over a year ago to raise $260,189. Since then they've been pushing out Alpha builds to backers, and they provided us with an early copy too. Many builds later, many hours played and it's clearly shaping up to be an impressive game.
Keep in mind it's thoroughly unfinished, rough in many areas but already something of a gem and a title I happily keep going back to. It already feels something a little like RimWorld and perhaps even a little The Sims in space. You build a ship tile-by-tile, ensure your crew has all they need and deal with any issues that come up. Explore derelict ships, encounter hostile aliens and more. Absolutely tons of potential that I hope to see made a reality as a huge space sci-fi fan.
BugByte's plan is to remain in Early Access for 1-2 years at least, as they said they want to keep updating it until they feel it's become a "true gem among indie games". Their support for Linux has been fantastic too with this and their previous games working well.