Very original idea, and a perfect match for the jam theme.
I think it would be a good idea to have give a star or % matching score for a shape (once it gets close enough) so players can go through the shapes, gettings a 'close' match first and then go back to refine the shapes they have not quite got perfect later on. This means if you get stuck where you can't quite figure out the last few adjustments you get get 1 or 2 stars, and the eventually go back to get 100% on everything.