A and D to move Space to jump GRAVITYYY :D I think this is kinda advanced gravity (Don't use it, its not that good. It relies on momentum and speed.)
NEW: added size and gravity changes with size. This was made for the Up In The Clouds SDS. The bird jumps up when it touches the clouds, this is intended! because of the momentum you gave the bird by holding down the button, the number has to lower for it to fall