Very well done!
I am terrible at flappy games, but I still enjoyed it for a bit! The visuals are appealing and the controls are tight :)
On the flipside, I think the airplane sound is a bit lackluster, and in-game music would add to the experience.
I also just released a simple browser game made in Godot, if you want to check it out. Its called Kickity Kick :)
P.S. - My highscore is 26!