The art style is very good, congrats. But I think making the enemies so fast and putting a sign to inform the player about the key and the time they should press the corresponding button is really killing the gameplay. I'm just waiting to see the next sign and the pole where I should press the button. So you are actually taking the decision making and the sense of accomplishment from the player and turning the player to a robot that just presses a button when told so. Also, the scroll speed begins to tire the eye after 30 points or something.
In short; great idea and art but the gameplay does not meet the expectation for me.