Off! Sorry I didn't answer this, I was a bit busy, I'm updating it sooner than later after I finish some tests in schools, hopefully soon the art for the ball will resemble yarn, and also I add another note type, and on the note of adding custom songs... I want to do that, but not yet! Also thank you so much for you feedback.
Edit: On the part of difficulty rating, I'm planning on that after I finish the base (After my tests and stuff) and also for the menu design I was actually going for the simple menu design though I may add a easter egg or two similar to the ones on the stardew valley menu screen.