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It said that stuffit is unable  to determine the file format

Hm. Ok. I tried it and it worked... then u gotta try allowing to open the apps without certificate...

It just said that the game quit unexpectedly

I really don't know what the issue is... What macOS version do you use?

10.12.6 MacOS Sierra

Thanks for the info. I'll take a look and try to find the issue.

Hm. So I read a lot about the GameMaker engine and its problems, did lots of testing but I cannot find an issue. I used El Capitan for testing and it works fine. Seems like this problem can't be solved properly. I am really sorry.