Wife isn't too happy about the choice of the horn for the end-of-timer sound, for her the hourglass makes her think of @jmechner's Prince of Persia so she would prefer something like the first beats of the PoP intro sounds to play. The heartbeat for the last 10 seconds could also be an idea. But obviously those sounds are copyrighted so I have to find free alternatives (preferably under CC0 or similar free culture license).