I seriously don't mind the flappy bird game play concept.. But come on... pipes as obstacles :/
With some original artistic design this game can work so much more! Like, I don't know, instead of pipes at the bottom. Make some football opponents trying to steal the ball, make them run at you or jumping up to get the ball. Make them choreograph how high they will jump or if they stay at the ground with animations. Add some other obstacles in the sky to make it challenging. A goalpost would also be fun to aim at, like if there was a goalkeeper preventing you to score a goal. A crowd cheering you on if you do good..
Tl:dr, I see potential if you give this game some more time in the oven. :)