Great game
That was fun, thanks :).
I have one suggestion (its still a good game though);
perhaps have a harder setting - where the tones play much faster?
That way people could play longer and at the pace that suites them. I would have given it 5/5 if it had that ;)
In the future, would you ever consider making something similar that would teach musical notes/ or how to recognise matching tones octaves apart and stuff like that?
I think that would be fun and educational (not that everything has to be educational :P :) )