If you are specifically looking for free-to-play experiences in the space management genre, consider these options:
In this tycoon simulator, players take on the role of a station commander with several core responsibilities: Space Station Tycoon Download Free PC Game
While is not officially a "free" game, it is widely available at a very low price point on official platforms and through verified key retailers. It is a management and strategy simulation developed by Lunheim Studios where you build and oversee a space station in a lost sector. Where to Download and Pricing If you are specifically looking for free-to-play experiences