Yeah we have added sounds ,maybe you pressed the mute button (top left corner)?
I will look through it to see if I can find anything that can cause this issue.
Don't worry ! That's totally okay if other people can hear sounds that's what really count...
That's probably a sound bug with my computer but I can hear other things like music or sounds in other games... That's weird...
I think that it's the web player that makes this bug...
But don't worry everything is fine !