Well, the concept is very interesting; the game is engaging, I got stuck for about 20 minutes, but I couldn't get past level 10. Moreover, levels 4, 7, and 9 are much easier than even 2, let alone 3. The tilt controls provide more hope than real help — in the end, it requires taking small steps to progress, so level 10 with the jump and 2 cubes became impassable for me : ( Overall, if you move a bit away from the physics model towards an arcade style, I think it would be beneficial.