ScoreManager.cs

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

public class ScoreManager : MonoBehaviour
{
    public static int score;

    Text text;

    // Start is called before the first frame update
    void Start()
    {
        text = GetComponent<Text>();


        //score = 0;
        score = PlayerPrefs.GetInt("PlayerCurrentScore");
    }

    // Update is called once per frame

    void Update()
    {
       if (score < 0)
       score =0;
       text.text = "" + score;

    }

    public static void AddPoints(int pointsToAdd)
    {
        score += pointsToAdd; // Add points to the score

        PlayerPrefs.SetInt("PlayerCurrentScore", score); // Save the score in the PlayerPrefs to next level
    }

    public static void Reset()
    {
        score = 0;

        PlayerPrefs.SetInt("PlayerCurrentScore", score); // Save the score in the PlayerPrefs to next level incase loss of points
    }
}