itch.io

Open Finder, then look for the desktop goose file. There might be multiple, so delete all of them.

If you just want to turn it off without deleting it (delete it by simply deleting the folder) then hold esc and look in the top left for a bar and keep holding it once it fills up the goose will be gone or look in the folder for a thing that says close goose then use that to remove it.