Unity3d no-turning scriptgub

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class scriptgub : MonoBehaviour
{
    public GameObject laszerShot;
    public GameObject lazerGun;
    public float shotDelay;
    public float speed;
    float nextShotTime;

    Rigidbody ship;
    // Start is called before the first frame update
    void Start()
    {
        ship = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update()
    {
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");
        ship.velocity = new Vector3(moveHorizontal, 0 , moveVertical)*speed;

        //без поворота

        ship.transform.localRotation = Quaternion.Slerp(ship.transform.rotation,
 Quaternion.Euler(0, 0, 0), speed * Time.deltaTime);

        if (Input.touchCount > 0)
        {
            print(Input.touchCount);
        }



        if (Time.time > nextShotTime)
      {
           Instantiate(laszerShot, lazerGun.transform.position, Quaternion.identity);
           nextShotTime = Time.time + shotDelay;


        }

    }

}