I have no idea how this was done, but then, I fell off the LittleBigPlanet wagon a long time ago. This is "Hyper Hexagon", an adaptation of Super Hexagon rendered within LittleBigPlanet 2.
Super Hexagon creator Terry Cavanagh knows about it; he retweeted a link to the game yesterday. Enjoy.
Super Hexagon Meets LittleBigPlanet In Insane Video [GameInformer]