Mac project not running

Hey, heres the thing. I just finished a project on windows that my clients want to play in their Mac so I zipped and migrated it to my Macbook. It worked fine, just had a few materials mistakes and expected performance issues. So, with all fixed now, I packaged it for Mac and it worked nice in my laptop (the folder had only one file, the project.exe) but when I uploaded it to google drive for a friend to play it his laptop wasnt able to run the packaged project. Then a message poped out saying his mac wouldnt run the program because it wasnt able to verify develper. Another fact is that when I uploaded it to Drive the zipped folder had many other files and folders (just like in windows). What am I doing wrong?