It was a great game! It certainly was difficult, but given time, I think that you could get better at the levels. Other than the side hits, tapping notes at the correct time was challenging. I think having a visual aid for tapping notes correctly would help. A circle around the player would help us line up when to tap for the shrinking circles. Also having a visual (like changing the color of the shield) when you tap would help you to know whether you were early or not.
This game is going in a great direction! I can't wait to see the rest of the game.