If you open gms2 on the top left of the Window, there should be an icon and it looks like an arrow pointing into a box. It says "Create Executable", if you press on it you can make an .dmg or .zip (I can open .zip , but not .dmg (but others can)). Those are two ways to change your game into something playable for ppl who don't have gms2. You won't be able to do so if you didn't buy gms2.
If you go into gms2, then go onto the top left of your screen ( should be around the top of your screen somewhere) go to File and then Export game into a YYZ , then I should be able to open it with gms2.
But you can only make the game able for either Mac or Windows ( or others) depending on where you actually change the game into an Executable.
Also if you play on Mac, there is a chance that you can't start it, after changing into an Executable.
If that's the case you need to do these steps each time you create a new project:
1. go to Game Settings in your gms2 window (top left of the window)
2.click on Mac
3.There is a boy for Game Name and so on. There should be a box for "Signing Identifyer", make sure to leave the box blank, ears everything written in it and safe.
If you have any questions at all about gms2, I can't say know everything, but I could help you if you need anything.
If you didn't buy it, just send me yyz and I change it for you.
I hope I could help in any way!
Sincerely just a random human!