Bean

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

The minimum requirements for Bean are: Windows 7, Intel HD Graphics 520, 2 GB RAM, 512 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.

No. Bean is a single-player game.

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

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