`brew install gdevelop` gives a SHA256 mismatch error. Yes, there are many possible and valid reasons why a binary might be re-uploaded (thus resulting in a different SHA hash), but still, not a good first impression.
You seem to imply that the brew formula was made by the same developers. But I'm not sure that's the case. Using brew doesn't seem to be the recommended way, the website just gives you a download link.
I can confirm that GDevelop hasn't been added to homebrew yet.
It's recommended to either download the app or use the webapp!
Indeed, we (GDevelop core team) never made a brew formula... but maybe we could work to have it maintained officially?