Originally for the GMTK game jam, the theme was genre without mechanic so I chose rhythm without music, but someone suggested to put this game into music game jam. I also don't know any music programs to make music.
Thank you for the feedback, if I ever do go back on this idea I will make it have a real challenge. Adding musical elements to the arrows will is a interesting idea and may incorporate that into later games that I will make.
Thank you for the criticism, I do have the difficulty increase overtime but didn't have enough time to tweak it. If I do ever come back to this idea I will implement some of the ideas you have presented.