GameManager.cs

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

public class GameManager : MonoBehaviour
{
    public static GameManager instance; // Define a static instance variable

    public Transform platformGenerator;
    private Vector3 platformStartPoint;
    public PlayerController thePlayer;
    private Vector3 playerStartPoint;
    private PlatformDestroyer[] platformList;

    public ScoreManager theScoreManager;

    public DeathMenu theDeathScreen;

    public bool powerupReset;


    // Start is called before the first frame update
    void Start()
    {
        instance = this; // Assign the current instance to the static variable

        platformStartPoint = platformGenerator.position;
        playerStartPoint = thePlayer.transform.position;

        theScoreManager = FindObjectOfType<ScoreManager>();
    }

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

        // Update logic here (if needed), but don't place methods here
    }

    // Method to restart the game
    public void RestartGame()
    {
        theScoreManager.scoreIncreasing = false;
        thePlayer.gameObject.SetActive(false);
        theDeathScreen.gameObject.SetActive(true);

       // StartCoroutine(RestartGameCo());

    }
    public void Reset()
    {
       theDeathScreen.gameObject.SetActive(false);
        platformList = FindObjectsOfType<PlatformDestroyer>();
        for (int i = 0; i < platformList.Length; i++)
        {
            platformList[i].gameObject.SetActive(false);
        }

        thePlayer.transform.position = playerStartPoint;

        platformGenerator.position = platformStartPoint;
        thePlayer.gameObject.SetActive(true);

        theScoreManager.scoreCount = 0;
        theScoreManager.scoreIncreasing = true;

        powerupReset = true;
    }
}