It doesn't seem to work for me. Tried a couple other solutions posted on that site and couldn't do it.
Yes, I think it is a problem with the OS I'm running, but it's strange that I can run most other games, but not yours unfortunately. So I assume there could be something you can do. I could be wrong however. I looked up some details about your game and assume, you built it with Unity (?).
I have found this on the web, which might helps: https://forum.unity.com/threads/issue-opening-unity-mac-applications-on-mac-big-...
Let me know if you can figure it out :)