332 days ago (+1)
You can save a local copy from the main menu. (File -> Save As...)
The ".deck" file can be opened and run by using Decker, which is available for Windows, MacOS and even Linux if you wish to compile it yourself. Alternatively, if you save with a .html extension you'll get a self-contained document that you can open in any web browser.
If you set up your favorite color palette before saving, Wigglypaint will have those colors as the default the next time you open it.