There are some things that you need to change... First, the hit area, don't know if it's the enemies area or the player area, is way too big to play fine.
Then, you should add a score or some kind of point system that shows the performance of the player. 2/5
Look! I have one minute of delay between the arrow and the note! The game is so funny now... Fix that please, I do not have any kind of lag, the songs just start some seconds after the arrows start moving.
The only thing that you can do to help is visiting the game, give to it gameplays and if possible, click ads... Not a nice method but the most effective indeed.
thanks for your feedback!