Scriptum/Assets/DisplayLvl.cs

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

public class DisplayLvl : MonoBehaviour
{

    public Text displayText;


    void Update()
    {
        int lvl;
        string lvlString;

        lvl = PlayerPrefs.GetInt("lvl");
        lvlString = lvl.ToString();
        displayText.text = lvlString;

    }

}