There's a much deeper thing going on here than Flappy Bird. The rhythm of it is more multi-dimensional. Flappy Bird works really in one dimension. This works more in two dimensions. Also there's a Tetris-like quality to it where the difficulty increases as you get higher up the page. It's also superior to Flappy Bird because there is more decision-making: do I wait for the wobble to make another cycle to make the turn, or do I rush and thrust now in the direction I'm going. Decision-making is what all good games are about, and this has better decision opportunities than Flappy Bird by a mile.