itch.io

https://store.steampowered.com/app/1782210/Crab_Game/

No, it would be ~/Library/Application Support/Steam/steamapps/common

~/ is your home directory not your username. 

https://www.youtube.com/watch?v=s2na63nT32sa

Download through chrome.

ALL MAC USERS: Follow this tutorial and use Mac 64bit no matter what. I had zero success with the Mac Silicon version on my M1 MacBook Air, however using the 64bit version everything worked fine.

https://itch.io/post/4880634

The game works entirely, servers ARE findable and joinable. Just follow this tutorial accordingly.