Thank you for playing.
I think you have a point, it can be hard to know the right timing without any visual or hearing help. We are aware that hitting the notes can be difficult, and we actually had to make some changes because it was too hard, but at the same time, we noticed that when you repeat the level many times, you will be able to get a high score naturally, like if you were learning how to play an instrument. So, we tried to balance the difficulty without erasing this feeling of progress, but as you could see, we have more work to do. Anyway, we're glad that you had a good time playing.