press "d" to enter/leave draw mode
press space to add a new point
press "c" to toggle the point-debug view
press "v" to toggle viewing the lines
press "s" to select the circle nearest the mouse - if a cirlce is selected, the next adding point will be after the selected point in the path (and then that newly added point will be selected).
pressing "s" when your mouse is closest to the selected circle will deselect it and return point-addition to the end of the list
Open Controls
Here's the new load parameter for your GUI's constructor:
Automatically save values to localStorage on exit.