In Orbit

Yes. In Orbit is free to play on Steam, so there is nothing to buy to start playing.

The minimum requirements for In Orbit are: Windows 10, GeForce GTX 970, Intel Core i5-4590, 4 GB RAM, 500 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.

No. In Orbit is a single-player game.

No. Valve rates In Orbit as Unsupported on the Steam Deck.

Yes. In Orbit is the full base game. You need nothing else to play it.