I’ve been adding a lot of new features, including a new line rendering method using polygons which looks much better than just using line drawing in flash. That enabled the neat “tire track” effect you can see in the first image, by using a negative bias for first edge the polygons.
Also added is an opacity slider, speed multiplier, a bunch of new controls for the brush behaviour, a color mixing slider which makes the particles pick up the colors from the canvas and a bunch of other stuff. It’s a lot of fun!
A runnable is coming soon.