Gameplay seems a bit lacking.
I really love the aural rewards associated with getting longer chains. It does provide an extra point of interest and really encouraged me to attempt to link as many yellow balls as I could.
But by the time level 5 came around, I was a bit bored of the basic premise, having heard the little trills enough and not feeling much of a compulsion to expand my score.
When I was thinking about my score, there was some interest in working out how to optimise the bounces, but the level design could have done more to encourage or make use of that and it would have been really nice to have had some more variation. Maybe change the levels a bit more or add more items or obstacles.
I must say though - the presentation is wonderful.