Great game! It's interesting to see a game with basically the same gameplay concept and what you made of it. Your presentation is obviously very good, the visuals and especially the post-game screen with the accuracy and grade being shown motivates me to try again for a better score!
As others have already mentioned, it feels counterintuitive why you have chosen to make the "Hit top" the lower button and the "Hit Bottom" the upper button on the keyboard. Otherwise great entry!