You need to have steam downloaded, running in the background, and the latest version of crab game installed on steam, play it once using Proton (google it) and then follow these instructions:
click this link to download steam api and extract the files into "CrabGame_Data/Plugins"
https://github.com/rlabrecque/Steamworks.NET/releases/download/15.0.1/Steamworks...
Next you need to go where the Actual thing you click on to play it is located (executable) and save a .txt file (text document) called steam_appid.txt with this number in it:
1782210
Now you need to attempt to run the game, if it fails, follow these instructions to allow the game to run on your mac.
Let me know if this works. I'm doing a youtube tutorial for the linux version check out my channel here.