good, but has some bad points
I liked it, but its a little difficult to use... first, you cant "zoom out" the whole thing so you have a better view of it... also a copy/paste function, and/or a "move note" function would have been good, since it's a little hard to put the right note sometimes (but that's maybe cause I have a high screen resolution)... and the fact that you cant put two instruments doing the same note at the same time is also disappointing
anyway, I know this is a game and not a profesional music program, so, putting aside all those little problems, this is deserves a "Well Done!"