I'm happy to share the new rewrite of ijeomamotion a library for sketching animations like these: goo.gl/NZjG8, goo.gl/nUiH9. Ijeomamotion lets you can tween  numbers, colors vectors, beziers, curves and paths. It can also playback tweens in parallel, in a sequence or in a timeline. You can read more about it here  goo.gl/Xyoob.