Looks good, nice work

But there are few details, like everything gets deleted after rewind.
I really don't wanna steal your thread but I've found this solution to work a bit better for my workflow so it could help anyone else maybe:

It is simple setup with 3 nulls, 1st one act as control and you just constrain it to object or even cluster on an object so practicely you can trail tip of the nose for example. And two others are parented to this one, one have path animation ghost turned on and another one have object animated ghost, and you can change sise and shape simply by changing display options for that null.
Good thing about this setup is that is fully interactive and it updates the moment you change animation.
But I love seeing your work Ante

Keep up!