This is a beautiful game. The simplicity of the graphics allows for quick load and transition times between levels while allowing the growing effect to not be hindered by slow-downs. Very similar to Katamari Damacy but I count that as a positive.
My only issue was with the progression to bigger items being a little too exact. I spent a lot of time rolling around the earlier levels to find the 1 or 2 items I missed and needed to begin picking up the next largest things. Maybe adding more items of each size than is required to smooth out those sections.