On a Mac 10.15 Catalina when opening the error message 'The application "Game" can't be opened.'
I was able to fix that (And the same for a game I played previously) by following this tutorial: https://superuser.com/questions/1345755/how-to-fix-the-application-cant-be-opened-on-mac
I had to use the Recursive option (Which is explained in the comments of the top answer)
Unfortunately the game crashes for me when I open it... :/