Decker is fairly well-suited to making dollmaker-style games.
I did a brief writeup on modifying The Ornamented Ovum over on the Decker community forum: https://itch.io/t/2769322/the-ornamented-ovum . Anyone is welcome to use this game as a starting point for their own creations!
Decker comes with a number of interactive tutorial decks, but the most immediately relevant ones might be All About Draggable and All About Color.