I found the beginning area easy to get lost in, with the terrain not having any distinctive shape and having no real sense of direction on where to go it was a bit confusing, but once I eventually got past that into the main bit of the game, what I got was a solid "puzzle" platformer (idk if puzzle is really the right word here but you should understand what I mean). Rather simple, but enjoyable.
The transition effect for moving between the two worlds is really slick, both visually and with the music crossfade, good job on that!