That's interesting, I haven't encountered that yet. One possibility is that the timer ran out and you were late for the videocall which has the same effect. Thanks for commenting!
Thanks for your kind review. The whole thing is very unfinished, I only just managed to put together a stable version in the last two hours. Beginning dev with a full time job so I'm not unhappy with what I managed to throw together. Sound effects were going to be the next thing on the list :)
My mission for this game was to sneak in a learning element about music notation and ear training. In sheet music, though slightly more elaborate, you essentially note music like this; stacking instruments one bar at a time.