First thing first. I think the commenf section is rigged, or I would give it a higher rating instead.
It is not even a close imitation of violin. It does not have left hand motion, the correct position of the bow, or even a pause button when I am in the songbook screen. I get boring quickly because I realized that it only has a bow, and it does not help me develop my violin skill in real life.
Anyway, it is kind of boring to play the game. It does have potential to become "good", but it needs a lot of work. Again, if the developer is a new app designer, then it is a decent place to start your career.