Steam has Proton now which is a god send for Linux gaming. https://www.protondb.com/ which is just a setting in the Steam client.

For games it depends on what might interest you. If you are into history sorta stuff, maybe Civilization V or VI? If you want more of a fun game that a lot of non gamers play, you try The Sims or Stardew Valley. If you want something like the current trend of games, try Helldiver’s 2 or Baldurs Gate 3.

If you ultimately don’t have a preference. Just browse the sales on steam for games that look interesting as well as browsing https://www.humblebundle.com/ which can sometimes be good. Just check it against that protondb or look up if the game runs good on Linux first before purchasing.

If you do decide to stick with a Google phone over an iPhone, I would suggest a degoogled rom like GrapheneOS, LineageOS or CalyxOS instead of the stock google android