A função Button no Panel não Funciona

Diretor:

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

public class Diretor : MonoBehaviour
{
    [SerializeField]
    private GameObject imagemGameOver;
    public void FinalizarJogo()
    {
        Time.timeScale = 0;
        this.imagemGameOver.SetActive(true);
    }
    private Aviao aviao;
    private void Start()
    {
        this.aviao = GameObject.FindObjectOfType<Aviao>();
    }
    public void Reiniciar()
    {
        this.imagemGameOver.SetActive(false);
        Time.timeScale = 1;
        this.aviao.Reiniciar();
        this.DestruirObstaculos();

    }
        private void DestruirObstaculos()
        {
            Obstaculo[] obstaculos = GameObject.FindObjectsOfType<Obstaculo>();
            foreach (Obstaculo obstaculo in obstaculos)
            {
                obstaculo.Destruir();
            }
        }
}

Avião:

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

public class Aviao : MonoBehaviour
{
    private Rigidbody2D fisica;
    [SerializeField]
    private float forca = 4;
    private Diretor diretor;
    private Vector3 posicaoInicial;

    private void Awake()
    {
        this.posicaoInicial = this.transform.position;
        this.fisica = this.GetComponent<Rigidbody2D>();
    }
    private void Start()
    {
        this.diretor = GameObject.FindObjectOfType<Diretor>();
    }

    private void Update()
    {
        if (Input.GetButtonDown("Fire1"))
        {
            this.Impulsionar();
        }

    }

    public void Reiniciar()
    {
        this.transform.position = this.posicaoInicial;
        this.fisica.simulated = true;

    }

    private void Impulsionar()
    {

        this.fisica.velocity = Vector2.zero;
        this.fisica.AddForce(Vector2.up * this.forca, ForceMode2D.Impulse);
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        this.fisica.simulated = false;
        this.diretor.FinalizarJogo();
    }
}

Obstaculo:

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

public class Obstaculo : MonoBehaviour
{
    [SerializeField]
    private float velocidade = 0.15f;
    [SerializeField]
    private float Variacao;

    private void Awake()
    {
        this.Variacao = 1f;
        this.transform.Translate(Vector3.up * Random.Range(-Variacao, Variacao));
    }

    private void Update()
    {
        this.transform.Translate(Vector3.left * this.velocidade * Time.deltaTime);
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        this.Destruir();

    }
    public void Destruir()
    {
        GameObject.Destroy(this.gameObject);
    }
}