Personally I find that site less interesting. It vaguely resembles Win9x, but only vaguely, it's not even trying to be faithful, and you can't really do anything.

Compare that to michaelv.org (now defunct), which very faithfully reproduced Windows 3.1, complete with games, a filesystem, various small utilities, and such. Or to win95.ajf.me (which I made) which has an actual instance of Windows 95 in it, so you can fiddle about with the real thing.

I dunno. Windows 93 is fun, but it's not quite the same experience. I'd love to make something in the same vein as michaelv.org for Windows 95. I already have win95.ajf.me, of course, but a recreation of 95 is fun for its own reasons.