I have two problems with this game, and they're both about the unique platform shapes.
The rounded cloud platforms make it difficult to see where the platform ends and about of either side is actually not there even though it looks like it is; it gets a little frustrating after a while. And the floating island platforms, you can get stuck in between them in places where they are close to each other, trying to get through a place that looks like a gap but actually isn't.
It's very very pretty to look at, but it's just not as practical or smooth as it probably should be. Still cute though!