Enemy chasing the player ?

Hello

I'm creating a 2D game. I created some enemies(Ghost) and I want to do these enemies chase the player like Ghosts of Mario Bros for example.

If my player goes right or left of position enemy, I want rotate position y of enemy also.

How can I do this ?

I'm trying this.

 public class GhostEnemy : MonoBehaviour {
    
     //player
     private Transform player;
 
     //ghost
     public Transform ghost;
         
     public float moveSpeed;    
     private bool chasing = false;
     
 
     // Use this for initialization
     void Start () {
         player = GameObject.Find("PlayerObject").transform;       
     }
     
     // Update is called once per frame
     void Update () {        
         chasingPlayer();
     }
 
     private void chasingPlayer(){
         //distance of ghost and player
         float distance = Vector2.Distance(ghost.position, player.position);
 
         if(chasing){
             //rotate ghost 
             Vector3 dir = player.position - ghost.position;
             float angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
             transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
             
             //attack player                     
             Vector3 dir = player.position - ghost.position;
             dir.Normalize();
             ghost.position += dir * moveSpeed * Time.deltaTime;
 
             //distance > range, chasing false
             if(distance > 10f){
                 chasing = false;
             }
         }else{
             //distance < range, chasing true(attack player)
             if(distance < 5f){
                 chasing = true;
             }
         }
     }
 }