A quite frequent problem that people have when playing Graal on Mac is that they can't find the folder where their files are being stored, such as heads, bodies, tilesets, and for developers, scriptfiles. Normally regardless of where you install Graal, downloaded files will be stored inside a user-specific, but hidden, folder.
In order to locate this folder:
1. Focus on Finder by clicking the Finder icon in the Dock, or clicking on the desktop.
2. Select the "Go to Folder..." option in the "Go" menu.
3. Enter the following into the box: "~/Library/Application Support/Graal/", and press OK.
4. Voila; here is where Graal stores downloaded files (inside the levels/ folder), settings and other files.