On my laptop, I disliked that I couldn't scroll back to previous sections when you move, and wished I could scroll at my own pace. Whole thing was buttery smooth though, I'm impressed.
The button in the upper right pops out a map where you can re-enter a section.
I was completely unable to get it to "scroll": iPhone, MacBook running Firefox or Chromium, trackpad, arrow keys, the handle thingy on the right edge of the browser... nix nada nothing.