It would be nice to have a own section where you can set a background image and then define several "hotspots" which are clickable - on click there should be shown some text/image as popup/overlay. This would beak a little bit with the just-scroll-experience but in a good way (in my opinion) - if you have a long story, readers could find it painstaking to scroll through the whole piece containing scroll-visualizations etc.
A source of inspiration could be the hotspot-feature of Pageflow: