Oh gee, now Flappy Bird's on Newgrounds as well ;3
First of all, I have to say that the Mario music made me chuckle because those pipes look like they were ripped out of Super Mario World so it's very fitting and a nice stab at the original Flappy Bird.
Anyways, this is a nice adaptation of the game, though something you've done seems to have made it severely harder, it might be the speed that he falls or the arc or something, but it seems a lot harder to control him precisely. Nonetheless I did manage to get a score of 2 so it isn't unplayable, heh.
What I feel this needs is to use the scoreboard aspect of the Newgrounds API, since this is a game that relies on nothing but getting the "high" score. Being able to save your score and compare it to others probably would have added more re-playability, especially since people around here like to boast their stats. Some medals would have been nice too, like one for getting 10 points, etc.
You probably would have been better off making your own art and applying it to the mechanics of Flappy bird. That with the addition of medals and a scoreboard would have made this immensely better.
Seems you have potential as a game developer though. Hopefully you make something more original with more features next time. Good luck with your future games.