Wow thanks, that explains why the sound wasn't working for me.

Haha that's kind of funny. They go through all the trouble to make a canvas-based html5 game but they won't use the audio tag?

That really pisses me off.

I played through the whole (mediocre) game without sound.

The sounds MAKE this game! They could have mentioned they only did a half-assed HTML5 implementation and used Flash for audio.