Be careful not to click the drawing canvas accidentally because it will probably change your sketch.
Want to save a masterpiece sketch? You can try pressing "s" while the mouse is over the drawing canvas. (Be careful not to click the canvas accidentally.) If it works, you should get a dialog giving you a chance to save the file. It will be saved to the normal download folder. If that doesn't work, Windows users have another option. After making sure that mouse cursor is on this page, type Alt-Print Screen. Then you can paste the page into Paint (Start button -> Windows Accessories -> Paint) where it can be edited and saved.
The p5.js file: sketch.pjs.
James Brink, 6/25/2020