godot, move,between, to points, back and forth, up and down

enemy.gd

extends Area2D

@export var move_direction: Vector2
@export var move_speed: float = 100

@onready var marker_2d: Marker2D = $Marker2D

@onready var start_position: Vector2 = global_position
@onready var target_position: Vector2 = marker_2d.global_position

func _physics_process(delta: float) -> void:
	global_position = global_position.move_toward(target_position, move_speed * delta)
	
	if global_position.y == target_position.y:
		target_position.y = start_position.y
	if global_position.y == start_position.y:
		target_position.y = move_direction.y