How to move a character at an angle with velocity y

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You may want to use move_toward and a acceleration value, and only apply movement if there is a direction pressed.

I’ve never been a fan of seperating into a get_input function since it’s never used anywhere else, it’s just an extra function that drops the delta parameter.

func _physics_process(delta: float) -> void:
    var rotation_input := Input.get_axis("rotate left", "rotate right")
    # using math over if/else and use `delta`
    rotation += deg_to_rad(2) * rotation_input * delta

    var direction_input := transform.y * Input.get_axis("down", "up")
    if direction_input:
        # a good acceleration value may be 4 to 8 times speed, maybe 600
        velocity = velocity.move_toward(direction_input * rocket_speed, acceleration * delta)
    else:
        velocity.y += gravity

    move_and_slide()

Make sure to use proper formatting when pasting code