Impossible for the HN crowd: Stay inactive for 90 sec

Not so hard.

You can try to add detect if the user switch to another window.

There is a typo in the bottom, there is a missing "s" in "All right_S_ reserved"

Chrome mutes the autoplayed sound until you click somewhere. Perhaps you can add a fake "Click here to unmute button".

The rainbow progress bar change scale, but I expected that the yellow part disappears. This is an artistic choice anyway.