触れたらプレイヤーの重力を反転する

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

public class Player : MonoBehaviour
{
    Rigidbody2D rigid2D;
    bool gravity;

    void Start()
    {
        this.rigid2D = GetComponent<Rigidbody2D>();
        gravity = false;
    }

    void Update()
    {
    }

　　void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.CompareTag("gravity"))//オブジェクトにgravityタグ
        {
            if (gravity == false)
                gravity = true;
            else
                gravity = false;
            rigid2D.gravityScale *= -1;
        }
    }
}