HUD.cs

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

public class HUD : MonoBehaviour
{
    public TMPro.TextMeshProUGUI score;
    public TMPro.TextMeshProUGUI timer;

    void Update()
    {
        if(GameStorage.isPlay)
            GameStorage.timer -= Time.deltaTime;
        if(GameStorage.timer <= 0)
        {
            GameStorage.isPlay = false;
        }
        score.text = GameStorage.score.ToString();
        timer.text = $"{(int)GameStorage.timer} sec";
    }
}