My god, I forgot to check if someone gonna answer this, by the way, I have already fixed my problem with this:
func _on_start_no_health():
is_dead = true
_player = null
$Hurtbox/CollisionShape2D.set_deferred("disabled",true)
$shadow.visible = false
$Timer.start()
if player.position.y >= position.y:
anim_player.play("Dead Down")
if player.position.y <= position.y:
anim_player.play("Dead Up")
for L in $bigchunkbothsides.get_children():
if L.is_colliding():
if player.position.x <= position.x:
anim_player.play("Dead Left")
if player.position.x >= position.x:
anim_player.play("Dead Right")
But still thanks for your help, seeing someone answer my silly problem really make my day :v