Definitely interesting. You made a very simple mechanic that quickly blossomed into a fully functional physics game. The levels were definitely not in the right order - some of the last levels were also very easy, while some earlier ones were quite difficult. There also weren't that many shapes - no triangles or hexagons. Though, for what it is, it's short and fun. I also liked that a few of the levels required quick reflexes, it gave this an interesting twist.
I would have liked to see more levels with chains connecting certain objects, or perhaps slippery, sticky, bouncy, or breakable substances. Still really fun though.