What a damn good job! Love the concept, and how well it's implemented. The UI looks so polished and the tweening anims make it feel smooth.
As for some feedback, tracking two moving platforms feels a bit unfair since it's very difficult not only to spot the right color, but to know when to jump from one to the other. It would also be interesting to have maybe a fast tween animation of the color cube rotating when the mouse key is pressed so that the player can easily spot its position on the cube.
Congrats to both of ya!