What to say...? Well, this was not meant to be original. You even kept the original Flappy Bird name, so if your goal is just to make a perfect rendition then that's what I'll judge it on, and I will say you did a good job making an authentic rendition. The sounds and graphics seem genuine, and more importantly the physics feel the same too, although I only ever played the original Flappy Bird once.
I do have to mark a few points off simply because Flappy Bird is and always will be a gimmick and too simple of a game. The jumping concept is cool, but after you have that down it's just a matter of consistency and endurance. This game would have done well to be a fully-fledged platformer. This, however, is not deserving of a 5/5.