Creator here, also keen to know if anyone has suggestions. The r2d3 one was (obviously) a huge inspiration, it's such a nice way to learn things.
I can't seem to find it now, but either the NY Times or the Washington Post built something similar, for the 2018 US house/senate races. Lots of graphs as you scroll, with scroll-based events, IIRC.
EDIT: ah, how could I forget Nicky Case's explorabl.es! Was a huge inspiration for me as well.