@nprofile1q... Well, availability for Linux is (mostly) no longer required on Steam:
1. Install Linux
2. Install Steam
3. In Steam, choose the game you want to play and hit "Install" button
4. Hit "Play" button
5. Profit! 🙂

If the game does not run using the default compatibility settings for the first time, you can check ProtonDB pages whether tweaks are required...

Let me know should you require any more help running your game on Linux 😉

https://www.protondb.com