Great game, great gameplay loop. I really really like the graphics, it looks very polished and the game was a lot of fun.
Only thing is that unlocking platforms takes a bit too much time (maybe a countdown could be shown on screen to display how many more marbles have to be unlocked before the next expansion) and my playthrough saldy came to an abrupt end when the fourth (?) platform was only wide enough for one marble and disaster struck. Still was a fun experience.