ゲームクリア後もプレイヤーが動いてしまう

前提

Unitiy２Dの教科書を参考にしながら、強制横スクロールの中、音声入力でジャンプをし、ゴールを目指すゲームを作っています。

実現したいこと

プレイヤーがGoalタグ又はDeadタグに触れると、ゲームが停止してプレイヤーが動かなくなるようにしたいです。

発生している問題・エラーメッセージ

プレイヤーがGoalタグに触れた後にゲームクリア画面が出るのですが、ゲームが停止しないため、クリア画面の後ろでプレイヤーが移動してしまい、Deadタグに触れてゲームオーバーの画面が出てきます。

該当のソースコード

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

public class PlayerController : MonoBehaviour
{
    Rigidbody2D rbody2D;
    float axisH = 0.0f;
    public float jumpForce = 350f;
    public int jumpCount = 0;

    bool onGround = false;
    public static string gameState = "playing";//ゲームの状態
    public int score = 0;

    Animator animator;
    public string stopAnime = "PlayerStop";
    public string moveAnime = "PlayerMove";
    public string jumpAnime = "PlayerJump";
    public string goalAnime = "PlayerGoal";
    public string deadAnime = "PlayerDead";
    string nowAnime = "";
    string oldAnime = "";

    /////////////////////////////////////
    [SerializeField] private string m_DeviceName;
    private AudioClip m_AudioClip;
    private int m_LastAudioPos;
    private float m_AudioLevel;

    [SerializeField] private GameObject m_Cube;
    [SerializeField, Range(10, 100)] private float m_AmpGain = 10;



    void Start()
    {
        rbody2D = GetComponent<Rigidbody2D>();
        animator = GetComponent<Animator>();
        nowAnime = stopAnime;
        oldAnime = stopAnime;

        gameState = "playing";

        string targetDevice = "";

        foreach (var device in Microphone.devices)
        {
            Debug.Log($"Device Name: {device}");
            if (device.Contains(m_DeviceName))
            {
                targetDevice = device;
            }
        }

        Debug.Log($"=== Device Set: {targetDevice} ===");
        m_AudioClip = Microphone.Start(targetDevice, true, 10, 48000);

    }

    void Update()
    {
        axisH = Input.GetAxisRaw("Horizontal");

        float[] waveData = GetUpdatedAudio();
        if (waveData.Length == 0) return;

        m_AudioLevel = waveData.Average(Mathf.Abs);

        if (m_AudioLevel > 0.02 && this.jumpCount < 2)
        {
            Debug.Log("jump");

            this.rbody2D.AddForce(transform.up * jumpForce);
            jumpCount++;
        }
        if (gameState != "playing")
        {
            return;
        }
    }

    void FixedUpdate()
    {
        if (gameState != "playing")
        {
            return;
        }

        if (onGround)
        {
            if (axisH == 0)
            {
                nowAnime = stopAnime;
            }
            else
            {
                nowAnime = moveAnime;
            }
        }
        else
        {
            nowAnime = jumpAnime;
        }

        if (nowAnime != oldAnime)
        {
            oldAnime = nowAnime;
            animator.Play(nowAnime);

        }
    }

    void OnCollisionEnter2D(Collision2D other)
    {
        if (other.gameObject.CompareTag("Ground"))
        {
            jumpCount = 0;
        }
    }

    void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.tag == "ScoreItem")
        {
            ItemData item = collision.gameObject.GetComponent<ItemData>();
            score = item.value;

            Destroy(collision.gameObject);
        }

        else if (collision.gameObject.tag == "Goal")
        {
            Debug.Log("Goal");
            Goal();
        }

        else if (collision.gameObject.tag == "Dead")
        {
            Debug.Log("dead");
            GameOver();
        }
    }

    public void Goal()
    {
        animator.Play(goalAnime);

        gameState = "gameClear";
        GameStop();
       
    }

    public void GameOver()
    {
        animator.Play(deadAnime);
        gameState = "gameover";
        GameStop();
    }



    private float[] GetUpdatedAudio()
    {

        int nowAudioPos = Microphone.GetPosition(null);// nullでデフォルトデバイス

        float[] waveData = Array.Empty<float>();

        if (m_LastAudioPos < nowAudioPos)
        {
            int audioCount = nowAudioPos - m_LastAudioPos;
            waveData = new float[audioCount];
            m_AudioClip.GetData(waveData, m_LastAudioPos);
        }
        else if (m_LastAudioPos > nowAudioPos)
        {
            int audioBuffer = m_AudioClip.samples * m_AudioClip.channels;
            int audioCount = audioBuffer - m_LastAudioPos;

            float[] wave1 = new float[audioCount];
            m_AudioClip.GetData(wave1, m_LastAudioPos);

            float[] wave2 = new float[nowAudioPos];
            if (nowAudioPos != 0)
            {
                m_AudioClip.GetData(wave2, 0);
            }

            waveData = new float[audioCount + nowAudioPos];
            wave1.CopyTo(waveData, 0);
            wave2.CopyTo(waveData, audioCount);
        }

        m_LastAudioPos = nowAudioPos;

        return waveData;
    }

    void GameStop()
    {
        Rigidbody2D rbody2D = GetComponent<Rigidbody2D>();
        rbody2D.velocity = new Vector2(0, 0);

    }
}

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


public class GameManager : MonoBehaviour
{
    public GameObject mainImage;
    public Sprite gameOverSpr;
    public Sprite gameClearSpr;
    public GameObject Panel;
    public GameObject restartButton;
    public GameObject nextButton;

    Image titleImage;


    //+++スコア追加+++
    public GameObject scoreText;        //スコアテキスト
    public static int totalScore;       //合計スコア
    public int stageScore = 0;            //ステージスコア

    // Start is called before the first frame update
    void Start()
    {
        Invoke("InactiveImage", 0.0f);
        Panel.SetActive(false);
        UpdateScore();
    }

    // Update is called once per frame
    void Update()
    {
        

        if (PlayerController.gameState == "gameClear")
        {
            mainImage.SetActive(true);
            Panel.SetActive(true);
            mainImage.GetComponent<Image>().sprite = gameClearSpr;
            PlayerController.gameState = "gameend";

        }

        else if(PlayerController.gameState=="gameover")
        {
            mainImage.SetActive(true);
            Panel.SetActive(true);
            Button bt = nextButton.GetComponent<Button>();
            bt.interactable = false;
            mainImage.GetComponent<Image>().sprite = gameOverSpr;
            PlayerController.gameState = "gameend";
        }

        else if (PlayerController.gameState == "playing")
        {
            //ゲーム中
            GameObject player = GameObject.FindGameObjectWithTag("Player");
            PlayerController playerCnt = player.GetComponent<PlayerController>();
            if (playerCnt.score != 0)
            {
                stageScore += playerCnt.score;
                playerCnt.score = 0;
                UpdateScore();
            }
        }


    }

    void InactiveImage()
    {
        mainImage.SetActive(false);
    }


    void UpdateScore()
    {
        int score = stageScore + totalScore;
        scoreText.GetComponent<Text>().text = score.ToString();
    }
}