I like the concept, but this is very similar to the idea that Shift has. I know the appearance is different but the concecpt is very similar. Keep up the work, but remember that someone else has done something similar to this game, so try to make this kind of idea yours. Add monsters, wormholes, spikes, points, or even certain "up-grades" that may or may not help out the player.
Like the concept, but remember it has been done before so make this game yours, not a reflection of another.