---

StartButton.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
 
public class StartButton : MonoBehaviour
{
	public void StartGame()
	{
		SceneManager.LoadScene(1);
	}
 
}


ExitButton.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
 
public class ExitButton : MonoBehaviour
{
	public void ExitGame()
	{
		Application.Quit();
		Debug.Log("Мы вышли из игры");
	}
}