NavMesh в Unity2D (игра с видом сверху

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class II_enemy : MonoBehaviour
{
    public Rigidbody2D rb;
    public float speed;
    private Transform target;
    Vector2 PlayerPos;
    int hp = 5; 
 
    // Start is called before the first frame update
    void Start()
    {
        target = GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>();
    }
 
    void FixedUpdate()
    {
        var dir = target.position - transform.position;
        var euler = transform.eulerAngles;
        euler.z = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
        euler.z = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg - 90.0f;
        transform.eulerAngles = euler;
    }
    // Update is called once per frame
    void Update()
    {
        transform.position = Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
    }
 
 
    void OnCollisionEnter2D(Collision2D enemy)
    {
        if(enemy.gameObject.tag == "bullet")
        {
            hp--;
        }
        if(hp == 0)
        {
            Destroy(gameObject);
        }
 
    }
 
}