Great game and an interesting and unique concept. I like how you took a simplistic gameplay mechanic but made it complex with the different levels, a tutorial, and that devilish inclusion of the purple showing up (totally didn't throw me off completely and made me start from the beginning :) ) . To improve, I would expand with some different levels that maybe included some sound mechanics (i.e. click the button when you hear a certain sound effect). Overall, great work and good job.