I like the idea of this game but I was a bit confused while I was playing. I think that the idea of playing piano notes to jump was really cool but I think that it would have been a bit more interesting if each piano key had a different effect. I saw that number 5 had a different effect than the other ones but I didn't notice a difference on the other notes. A possible idea for the future if you plan on continuing to develop this game is having areas which you can only pass through when the cube is a certain color (and the piano keys make the cube change the color). You could also make each one of the keys do a different jump height which is kind of getting into a cross between an infinite runner (like you have) and guitar hero which could be an interesting idea. Keep up the good work!