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It worked for me on desktop - but not on mobile.

Worked for me on iPad OS with an external keyboard

Use your arrow keys. The sliders are the graphics. You'll see once you move around a little.

this took me so long to figure out.

Don't click the blue arrow (I know the site directions say you should.)

Load the site, then use your arrow keys and space bar.

Worked for me in Chrome and Safari.

Because the entire game code is encoded in the hash fragment on the URL. So it will depend on whether your browser respects such a long URL.

[Edited to correct: not GET data, but the hash fragment.]

Which browser should we use?

It works for me on current versions of Firefox and Chrome! :) (On the desktop)