Forgetting the fact that the 'Flappy Bird' concept has been done to death, I think your app needs an entire makeover. I'd start with cleaning up the graphics. I'm not sure what program you're using, but it looks like MS Paint. I recommend GIMP (if you need a free program) or Adobe Photoshop (if you can afford it). Flappy Bird at least looked polished, but this app has a ways to go to reach "completed" status. Also, the challenge is nonexistent here. Make the bars closer to one another so the player has a smaller gap to pass through, speed it up, and increase the gravity a bit. Add something unique to the game as well. There are a few out there that allow the player to get "powerups" when they reach certain milestones, and there are other games that change the character's appearance after they've reached a milestone. Consider that there are hundreds of Flappy Bird knockoffs all trying to become "the next big thing", so do something that places your game at the top of the pack.