Как мне изменить код, чтобы объект не вращался по оси Y (то есть только по оси X) (без ошибок)

Как мне изменить код, чтобы объект не вращался по оси Y (то есть только по оси X) (без ошибок)

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(Rigidbody))]

public class BodyMove : MonoBehaviour {

    // PUBLIC
    public SimpleTouchController leftController;
    public SimpleTouchController rightController;
    public float speedMovements = 5f;
    public float speedContinuousLook = 100f;
    public float speedProgressiveLook = 3000f;
    public bool continuousRightController = true;

    // PRIVATE
    private Rigidbody _rigidbody;
    private Vector3 localEulRot;
    private Vector2 prevRightTouchPos;

    void Awake()
    {
        _rigidbody = GetComponent<Rigidbody>();
        rightController.TouchEvent += RightController_TouchEvent;
        rightController.TouchStateEvent += RightController_TouchStateEvent;
    }

    public bool ContinuousRightController
    {
        set{continuousRightController = value;}
    }

    void RightController_TouchStateEvent (bool touchPresent)
    {
        if(!continuousRightController)
        {
            prevRightTouchPos = Vector2.zero;
        }
    }

    void RightController_TouchEvent (Vector2 value)
    {
        if(!continuousRightController)
        {
            Vector2 deltaValues = value - prevRightTouchPos;
            prevRightTouchPos = value;

            transform.localEulerAngles = new Vector3(transform.localEulerAngles.x - deltaValues.y * Time.deltaTime * speedProgressiveLook,
                transform.localEulerAngles.y + deltaValues.x * Time.deltaTime * speedProgressiveLook,
                0f);
        }
    }

    void Update()
    {
        // move
        _rigidbody.MovePosition(transform.position + (transform.forward * leftController.GetTouchPosition.y * Time.deltaTime * speedMovements) +
            (transform.right * leftController.GetTouchPosition.x * Time.deltaTime * speedMovements) );

        if(continuousRightController)
        {
            transform.localEulerAngles = new Vector3(transform.localEulerAngles.x - rightController.GetTouchPosition.y * Time.deltaTime * speedContinuousLook,
                transform.localEulerAngles.y + rightController.GetTouchPosition.x * Time.deltaTime * speedContinuousLook,
                0f);
        }
    }

    void OnDestroy()
    {
        rightController.TouchEvent -= RightController_TouchEvent;
        rightController.TouchStateEvent -= RightController_TouchStateEvent;
    }
}