Great concept, but...
The problem is that many of the levels can easily be done just by standing and waiting for the sand to carry you to the exit. There was one level where you were clearly meant to wall-jump onto the small platforms, but all I did was let the sand carry me to the exit. Another level is one of the last, where all you have to do is let the sand cover the spikes and then carry you up. However I did enjoy this game and the controls were fluid and smooth. 4/5, 9/10!