Prefab script values do not update

Hello all! So basically I have this random generator generates I prefab that I have at random times and at random positions between a range I have determined. So the problem is, I have so that if my score variable gets to a certain number, I want to update two other variables. However, this code only seems to update it for only 1 next game object being generated, but it does not permanently change the stats.

Here is the code:

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

 public class SpawnerScript : killEnemy {
 public GameObject enemy;
 public Vector2 spawnValues;
 public float spawnWait;
 public int startWait;
 public float spawnMostWait;
 public float spawnLeastWait;
 public bool terminate;

 // Use this for initialization
 void Start () {
     StartCoroutine(Spawner());
 }
 
 // Update is called once per frame


 public bool leveled;

 void Update()
 {
     int[] levelNums = { 5, 10, 20, 30, 40, 50 };
     for (int i = 0; i < 6; i++)
     {
         if (score == levelNums[i] && !leveled)
         { 
                 spawnMostWait += 1;
                 spawnLeastWait += 1;
                 leveled = true;
            
         }
     }
     spawnWait = Random.Range(spawnLeastWait, spawnMostWait);
     
     

 }

 void CollectSavedValues()
 {

     score = PlayerPrefs.GetInt("exampleIntSave");

 }
 void CollectSavedValuesDead()
 {

     dead = PlayerPrefs.GetInt("exampleIntSave");

 }

 IEnumerator Spawner()
 {
     yield return new WaitForSeconds(startWait);
     while (!terminate)
     {
         Vector2 spawnPosition = new Vector2(Random.Range(spawnValues.x-8, spawnValues.x), Random.Range(-spawnValues.y, spawnValues.y));


         Instantiate(enemy, spawnPosition + Vector2.zero, gameObject.transform.rotation);
         yield return new WaitForSeconds(spawnWait);
         
         if(dead == 1)
         {
             terminate = true;
         }
     }
 }
 }