shoot function for the player

func shoot():

    var _projectile = projectile.instance()
    get_tree().get_root().add_child(_projectile)

    if !sprite.flip_h:
        _projectile.direction = 1
        _projectile.position = position + Vector2( 8, 2) # Projectile spawn position
        movementVelocity.x = -movementSpeed * 2 # Knockback
    else:
        _projectile.position = position + Vector2(-8, 2) # Projectile spawn position
        movementVelocity.x = movementSpeed * 2 # Knockback

    sprite.scale = Vector2(0.75, 1.25)