Use the space key or click to flap. Press down arrow to dive. Press start, and choose the mode to play. Avoid rocks or you will explode. Birds don't live in caves. Also rocks aren't the correct color. Also birds don't explode. Comment, "The bird ate too much cheeseburgers!" if you see this.
I made this in a day. Also, if you pass impossible mode, tell me in the comments, and I will put your name in the "god" section below. GODS: None so far