the green thing

If you receive a warning message the file is damaged and should be moved to trash please follow the below instructions (this is due to an error in Gamemaker and macOS - the file is fine!).

Open a Terminal window and type the following command:
xattr -d com.apple.quarantine and then leave a space, and then drag the .app file onto the Terminal window and "drop" it, so Terminal will append the full path to the file for you.  Then press Enter/Return to actually run the command. Note that you don't get any "success" feedback. Now run the app. It should no longer be quarantined.

You can find the article on this here:
https://help.yoyogames.com/hc/en-us/articles/216753558-Mac-says-apps-damaged-whe...