I know you don't work there anymore, but that really doesn't feel "web native".
Front page images load several seconds after they're scrolled into view. I looked at the moon story and it was frozen for about 10 seconds before a start button appeared. In the story I can scroll, but it's about 5fps, and the blue dots and the secondary map are glitching on/through the moon.
I am using a relatively new smartphone, a galaxy s8, something with more power than most average consumers have (most people have a cheap budget phone, not the latest iPhone).
The format definitely was interesting tho, I can see the potential of these types of tools.