It includes imported libraries, primarily regl[1] which is 8228 lines long.

[1]: https://github.com/mikolalysenko/regl/blob/gh-pages/dist/reg...

I didn't spend much time optimising the size. I thought it loaded fast enough for me. But maybe it doesn't load as fast on a slow connection...

It's probably a bundled JS file containing all of his dependencies.

Node