It's such a shame that the HTML5 audio API's are still such a minefield that all these demos usually are silent.

Or the reverse: by now I have seen too many HTML/JS based games to remain really impressed by the technology - unless the demos start to provide audio.

Because honestly, a game like this needs matching 8bit sound effects. Too bad it's practically impossible to play them in a timely fashion, nor mix multiple of them together, let alone reliably generate them based on game state