Mitoza

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

The minimum requirements for Mitoza are: Windows XP, 1 GB RAM, 100 MB storage. It also runs on macOS. The recommended specs are in the System requirements section.

No. Mitoza is a single-player game.

Mostly, yes. Valve rates Mitoza as Playable on the Steam Deck: it runs, but may need some manual setup.

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