Menus Matter!
UI & Menus

using UnityEngine;
using UnityEngine.SceneManagement;

public class MenuActions : MonoBehaviour
{
    public void PlayGame()  { SceneManager.LoadScene("Village"); }

    public void QuitGame()
    {
#if UNITY_EDITOR
        UnityEditor.EditorApplication.isPlaying = false;
#else
        Application.Quit();
#endif
    }
}

using UnityEngine;

public class PauseManager : MonoBehaviour
{
    public GameObject pausePanel;
    bool paused;

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            paused = !paused;
            pausePanel.SetActive(paused);
            Time.timeScale = paused ? 0f : 1f;
        }
    }
}

using UnityEngine;

public class SettingsMenu : MonoBehaviour
{
    public void SetVolume(float value)
    {
        AudioListener.volume = value;
    }

    public void SetQuality(int index)
    {
        QualitySettings.SetQualityLevel(index);
    }

    public void SetFullscreen(bool isOn)
    {
        Screen.fullScreen = isOn;
    }
}

public Slider volumeSlider;

void Start()
{
    float vol = PlayerPrefs.GetFloat("volume", 1f);
    AudioListener.volume = vol;
    volumeSlider.value = vol;      // sync the UI
}

public void SetVolume(float value)
{
    AudioListener.volume = value;
    PlayerPrefs.SetFloat("volume", value);
}

IEnumerator FadeAndLoad(string scene)
{
    for (float a = 0; a < 1; a += Time.unscaledDeltaTime * 2f)
    {
        black.color = new Color(0, 0, 0, a);
        yield return null;
    }
    SceneManager.LoadScene(scene);
    for (float a = 1; a > 0; a -= Time.unscaledDeltaTime * 2f)
    {
        black.color = new Color(0, 0, 0, a);
        yield return null;
    }
}