I have three bugs to note:
1. this happens not every time but still a lot when im playing a song either at the beginning or in the middle of the song it will glitch and the notes stay in the same place while the song continues and I then die.
2. when I complete a song it doesn't take me to the menu or the screen telling your score my screen will go black and I have to refresh my tab with resets the game.
3. when I sometimes try to play it does not count any of my notes and kills me and I have to refresh my browser multiple times to get it to work again.
(thx for reading :)