Select the AnimatedSprite2D node

Add new SpriteFrames

Rename the default animation to flap

Add the 3 frames for the bird

Turn off looping

Select the CollisionShape2D

Add a new CircleShape2D

Resize it to surround the bird

Add a new Script to the Bird node

Set up constants for the physics

Create a reference to the AnimatedSprite2D

Create a function to apply gravity

Set the velocity to increase by gravity * delta

If velocity goes beyond the max

Lock velocity to fall speed

Create a function to simulate flying

If the flap action key is pressed

Play the flap animation

Increase velocity by flap force

Rotate the bird upwards

Create a function to rotate while falling

If velocity is pointing downwards

smoothly rotate the angle

Call all of these functions in process

Remember to call move and slide as

The final method call to start physics