想请教下各位大佬关于移动播放动画的问题

我是跟着这个教程走的，到了P3关于移动的环节按照教程一步一步输入代码但不知道为什么角色就是动不了，视频作者个人设置项太多了看的迷迷糊糊，代码也没报错，人物能够正常播放动画但移动不了。我先前做过横板卷轴但到了这个俯视角是真看不懂了，求求大佬帮忙解答一下，真的万分感谢
【Godot-2D 农场游戏"Crop Tails"制作教程[中文]】 https://www.bilibili.com/video/BV159mCYkEV3/?p=4&share_source=copy_web&vd_source=741e8fb76aa2bacf2da6c30dd7257d0f
class_name GameInputEvents
static var direction:Vector2
static func movement_input() -> Vector2:
if Input.is_action_pressed("walk_left"):
direction = Vector2.LEFT
elif Input.is_action_pressed("walk_right"):
direction = Vector2.RIGHT
elif Input.is_action_pressed("walk_up"):
direction = Vector2.UP
elif Input.is_action_pressed("walk_down"):
direction = Vector2.DOWN
else:
direction = Vector2.ZERO
return direction
static func is_movement_input() -> bool:
if direction == Vector2.ZERO:
return false
else:
return true
________________________________________________________________________
下面是走路的代码
extends NodeState
@export var player:Player
@export var animated_sprite_2d:AnimatedSprite2D
@export var speed: int = 50
func _on_process(_delta : float) -> void:
pass
func _on_physics_process(_delta : float) -> void:
var direction: Vector2 = GameInputEvents.movement_input()
if direction == Vector2.UP:
animated_sprite_2d.play("walk_back")
elif direction == Vector2.RIGHT:
animated_sprite_2d.play("walk_right")
elif direction == Vector2.DOWN:
animated_sprite_2d.play("walk_front")
elif direction == Vector2.LEFT:
animated_sprite_2d.play("walk_left")
if direction != Vector2.ZERO:
player.player_direction = direction
player.velocity = direction * speed
player.move_and_slide()
func _on_next_transitions() -> void:
if GameInputEvents.is_movement_input():
transition.emit("Idle")
func _on_enter() -> void:
pass
func _on_exit() -> void:
animated_sprite_2d.stop()