Great audio and visuals! As others have mentioned, it was difficult to know when to hit the arrow keys because the visuals and the audio don't sync exactly, but it was a fun experience! The animations in particular were very cool.
For feedback, you could try moving the arrow keys more central and lower, rather than at the top of the screen. for me at least I couldn't enjoy the visuals at all because my eyes were always up top. Also, I seemed to be hitting the arrows right after the other one disappeared because of the music. That or I'm just bad at rhythm games (which is also true... :)