Works for me, on Linux.

Works for me Firefox on Android mobile

Firefox, Windows 11.

It loads, I can navigate (drag), and click the white diamonds.

There are things like the RC truck and bowling ball that are not interactive and look like they should be, so I suspect it's a bug?

EDIT: OK it's a learning curve. With mouse/keyboard, you can click the hamburger icon in the top right, and get to an explanation of controls. I am able to use WADS to drive the truck and push the bowling ball (with the truck.)

I reloaded a second time and it worked in Firefox. First time, the circle loaded and then nothing. After it loaded, I saw no issues.