Solid implementation of a known type of gameplay. The indicator when you beat your high score is a good touch. The difficulty seemed to be too polarized. Most of the time it was very easy, then there are a few very difficult parts. Such as the one in your screenshot, with the tiny gap you have to drop through. Smoothing that out would be good. You put some good effort into polishing the game, such as the way the text moved, the bounce you do when you hit the ground, and the little star that comes up. I think you could have applied a bit more while the player was succeeding. A more pronounced flapping animation, particles when you flap, and so on.
Good work.