Game Manager

using UnityEngine;
using UnityEngine.UI;

public class GameManager : MonoBehaviour
{
    public static GameManager instance = null;

    [SerializeField] private Text balanceText;

    public static int balance;

    private void Awake()
    {
        if (instance == null)
            instance = this;
        else if (instance != this)
            Destroy(gameObject);
    }

    private void Update()
    {
        balanceText.text = balance.ToString();
    }
}