Fantastic! But...
you should add a point system allowing players to buy new coloured octagons, or completely different shapes in general, and if possible allow players to build their own stages and share them via; Facebook, or Gamecenter, or just a multiplayer option in-game. These are just some additions that could be implemented into this wonderful game. To be honest this game has taken up more of my time than I care to share, but to anyone considering downloading this app, you will not be disappointed, and I highly recommend you download!
~Fuzz about
Octagon 1: Maximal Challenge, v2.1.1