Godot 4 - Follow Mouse

extends CharacterBody2D

var speed = 300
var mouse_position = Vector2()
var target_position = Vector2()

func _physics_process(delta):

    mouse_position = get_global_mouse_position()
    target_position = (mouse_position - position).normalized()

    # This input will need to be created in the input map
    if Input.is_action_pressed("up"):
            velocity = target_position * speed
            move_and_slide()

    # This input will need to be created in the input map
    if Input.is_action_pressed("down"):
            velocity = -target_position * speed
            move_and_slide()

    look_at(mouse_position)