Wow, the blog post was really well-written, containing lots of interesting points for non-physicists interested in learning quantum mechanics, and the game seems fun. And on HN the author encounters a bunch of dreary know-it-alls going on about how they don't like java applets for some reason (apparently it upsets their anal notions of security in their little laptop world.) Just open it in firefox, it works fine.
I accidentally had appletviewer.exe it from the JDK, however the applet is served over http. I do appreciate this because I'd accidentally turned off HTTPS Everywhere and hadn't noticed (in weeks I suppose).
I think I'm not the target audience, I hope OP finds some good physicists to show this to :)