Try drawing e.g. a quarter circle. The non-angle-preserving version will add a corner at the end to get back to the starting angle, the angle-preserving version continues along the circle.
This one is super cool because your shapes stay more in place and just orbit the starting point! Makes it easier to draw something with multiple strokes that’s wiggly but doesn’t scatter away.
https://warms2.maxbittker.repl.co/
(it only works if you draw slowly right now, not sure why)
This whole tool was directly inspired by "grubs" here https://whichlight.github.io/draw-play/