Good concept, bad execution.
The idea of an invisible runner seems like a good idea, something innovative and new. Unfortunately the end product just feels unfinished. If you land on the edge of a block, the guy will slip off. If you jump anywhere your head goes through the above blocks, I've died hitting the electric currents that way. I have also gotten stuck on the corner of blocks, and that's just scratching the surface. The game wouldn't be has bad if it wasn't for the nearly impossible medals. People will often joke about how a game couldn't be harder if the player was invisible, well this game has an invisible player.