Menu functionality for the game Fey Foray

FadeInScreen.CS

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

public class FadeIn : MonoBehaviour
{
    public float fadeTime;
    private Image blackScreen;
    

    
    void Start()
    {
        blackScreen = GetComponent<Image>();
    }

    
    void Update()
    {
        blackScreen.CrossFadeAlpha(0f, fadeTime, false);

        if(blackScreen.color.a == 0)
        {
            gameObject.SetActive(false);
        }
    }
}

GameOver.CS

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

public class GameOver : MonoBehaviour
{

    public string levelSelect;
    public string mainMenu;
   
    private LevelManager theLevelManager;
    
    // Start is called before the first frame update
    void Start()
    {
        theLevelManager = FindObjectOfType<LevelManager>();
              
    }

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

    public void Restart()
    {
        PlayerPrefs.SetInt("coinCount", 0);
        SceneManager.LoadScene(SceneManager.GetActiveScene().name);
        Time.timeScale = 1f;
    }

    public void QuitToMainMenu()
    {
        SceneManager.LoadScene(mainMenu);

    }
    
}

IntroScreen.CS

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

public class IntroScreen : MonoBehaviour
{

    public string mainMenu;
    
    [Tooltip("Insert Pause Screen")]
    public GameObject theIntroScreen;

    public float pausedTimeScale;
    
    private LevelManager _theLevelManager;
    private CharacterController _thePlayer; 

    void Start()
    {
        _theLevelManager = FindObjectOfType<LevelManager>();
        _thePlayer = FindObjectOfType<CharacterController>();
        Time.timeScale = 0;
        _theLevelManager.levelMusic.Pause();
    }

   

    public void IntroScreenGo()
    {
        Time.timeScale = pausedTimeScale;

        theIntroScreen.SetActive(true);
                
    }
    public void ResumeGame()
    {
        Time.timeScale = 1;

        theIntroScreen.SetActive(false);

        _theLevelManager.levelMusic.Play();
    }

   

    public void QuitToMainMenu()
    {
        Time.timeScale = 1f;
        SceneManager.LoadScene(mainMenu);
    }
    
}

MainMenu.CS

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

public class MainMenu : MonoBehaviour
{
    public string firstLevel;
    public string tutorialLevel;
    public string[] levelNames;

    public AudioSource mainMenuBGM;

    public int startingLives;
    
    // Start is called before the first frame update
    void Start()
    {
        mainMenuBGM.Play();
    }

    // Update is called once per frame
    void Update()
    {
        
    }
    
    public void NewGame()
    {
        SceneManager.LoadScene(firstLevel);
        Time.timeScale = 1f;
        mainMenuBGM.Stop();
        
        
        // for a continue function 
        for(int i = 0; i < levelNames.Length; i++)
        {
            PlayerPrefs.SetInt(levelNames[i], 0);
        }

        PlayerPrefs.SetInt("CoinCount", 0);
        PlayerPrefs.SetInt("PlayerLives", startingLives);
    }

    public void Tutorial()
    {
        SceneManager.LoadScene(tutorialLevel);
        mainMenuBGM.Stop();
    }

    public void Quit()
    {
        Application.Quit();
    }
}

OptionsMenu.CS

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

public class OptionsMenu : MonoBehaviour
{

    public AudioMixer audioMixer;
    public GameObject theOptionsMenu;

    private void Update()
    {
        if (Input.GetButtonDown("pause"))
        {
            theOptionsMenu.SetActive(false);
        }
    }

    public void MasterVolume(float Master)
    {
        audioMixer.SetFloat("Master", Mathf.Log10(Master) * 20);

    }
    
    public void MusicVolume(float Music)
    {
        audioMixer.SetFloat("Music", Mathf.Log10(Music) * 20);

    }
    
    public void SFXVolume(float SFX)
    {
        audioMixer.SetFloat("SFX", Mathf.Log10(SFX) * 20);

    }
    
    
    
    
    
}

PauseMenu.CS

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

public class PauseMenu : MonoBehaviour
{

    public string levelSelect;
    public string mainMenu;
    
    [Tooltip("Insert Pause Screen")]
    public GameObject thePauseScreen;

    public float pausedTimeScale;
    
    private LevelManager _theLevelManager;
    private CharacterController _thePlayer;
    private PlayerSpawnUnit _theSpawner;

    [SerializeField] private DifficultyInfo _difficultyInfo;

    public GameObject Background;
    
    // Start is called before the first frame update
    void Start()
    {
        _theLevelManager = FindObjectOfType<LevelManager>();
        _thePlayer = FindObjectOfType<CharacterController>();
        _theSpawner = FindObjectOfType<PlayerSpawnUnit>();
        
    }

    // Update is called once per frame
    void Update()
    {
        if(Input.GetButtonDown("pause"))
        {
            if(Time.timeScale == 0f)
            {
                ResumeGame();
            }
            else
            {
                PauseGame();
                
            }
        }
    }

    public void PauseGame()
    {
        Time.timeScale = pausedTimeScale;

        thePauseScreen.SetActive(true);
        Background.SetActive(true);
        _theLevelManager.levelMusic.Pause();
        _theSpawner.gameIsStopped = true;
    }
    public void ResumeGame()
    {
        Time.timeScale = 1;

        _difficultyInfo.UpdateStats();
        thePauseScreen.SetActive(false);
        Background.SetActive(false);
        _theSpawner.gameIsStopped = false;
        _theLevelManager.levelMusic.Play();
    }

    public void QuitToMainMenu()
    {
        Time.timeScale = 1f;
        SceneManager.LoadScene(mainMenu);
    }
    
}