This is absolutely fantastic and feels very polished! Annoyingly I couldn't quite get the high score and got stuck at 4th or 5th place, but wow this a lot of fun! This would be really fun as a touch screen game. I think it would also be really nice if you got a small (say 2 secs) time boost for each connected call, so you were able to bump up your time (and therefore score) by reacting to the calls faster. Great game! :)