It's aiming for a "demoscene; psychedelic; trippy" aesthetic, as hinted at by the tags listed on page.
> "flashing hyper stuff"
You're getting it! That kind of vector animation isn't easy in HTML5.
Flash did have big arcs flying around the screen, at least in subtler background style. Even today there's not much "TV broadcast graphics" around on web, maybe for good reason, or because poor little mobile screens would choke, and need simple elements. Big screens can't have nice things.
> "flashing hyper stuff"
You're getting it! That kind of vector animation isn't easy in HTML5.
Flash did have big arcs flying around the screen, at least in subtler background style. Even today there's not much "TV broadcast graphics" around on web, maybe for good reason, or because poor little mobile screens would choke, and need simple elements. Big screens can't have nice things.