Mmmh, I am using Chrome, but also tried it in Microsoft Edge 42.17134.1.0... no joy grrrrrr :)
I'm playing right now with chrome and i used chrome for the whole development ... that's quite strange!
I see the page below, just click in the green highlighted area and then use the keyboard. Does that work?
I also modified the page background to dark gray, now you should see way better where "the game box is", click in it and the use the keyboard.
I tried to enable webgl as well by typing chrome://flags/ in the uri as suggested in google searches. I had some weird McAfee security plugin that I disabled as well... couldn't get it to work. No worries, I'll keep trying. It's probably just my browser. I see in comments someone got it working.... so it's something on my PC. I'm going to hit the sack now and get some sleep. Final push early tomorrow...
5 years ago(+1)
Hope you'll manage to get it to work. Keep me updated so i can fix any issue you find