RunRunRunP/Assets/Code/UI/RestartPanel.cs

using System;
using Code.GameplayServices;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace Code.UI
{
    public class RestartPanel : MonoBehaviour
    {
        [SerializeField] private Button restartButton;
        [SerializeField] private TMP_Text scoreText;

        private void Awake()
        {
            restartButton.onClick.AddListener(RestartGame);
        }

        private void OnDestroy()
        {
            restartButton.onClick.RemoveListener(RestartGame);
        }

        private void OnEnable()
        {
            ShowScore();
        }

        private void ShowScore()
        {
            scoreText.text = PlayerScoreService.Instance.Score.ToString();
        }

        private void RestartGame() => GameplayManager.Instance.RestartGame();
    }
}