Been done before
Not a bad looking game by any means, but I've played two other games that were exactly the same. In comparison yours looked the best between both of them, but it also seemed the slowest; which was the biggest downfall.
IMO this game is too boring to stand on its own. Maybe some powerups after so many levels could spice it up a bit. Such as super speed (increase characters speed) or slow plumet speed just for example.
If some cool things like that are added I'd come back for more.