How to make PlayerPrefs delete if the player didn't touch game finish collider

Hello, I'm making this game with 9 levels and in the beginning only level 1 is unlocked. Every level has three stars that can be unlocked with collecting points, something like this:

Now, I have a level finish collider at the end of each level and I would like that the next level unlocks when the player reaches that finish collider no matter how much points he collected.

As for the points and the stars, I would like to make that with playerprefs but I want playerprefs to only save if the player reaches the finish collider. If the player doesn't reach the finish collider, I want playerprefs deleted. I wrote few scripts to achieve this but the stars are unlocking even when the player dies or if I quit "play" through the editor.

This is an example of the game:

So, I have three scripts, one for game finish, GameManager script and the one for playerprefs. Unfortunately, with everything that I wrote the game is saving points and adding stars even when I don't reach game finish collider. For example, if I pick three points and then stop editor play or just hit gameover collider the game still saves picked up points and adds stars. How can I make that happen ONLY if the player reaches the game finish collider?

Script for game finish:

  public class GameFinish: MonoBehaviour
  {
      void OnTriggerEnter2D(Collider2D other)
      {
          if (other.gameObject.tag == "GameFinish")
          {
  
              GameManager.instance.GameIsFinished();
  
          }
      }
  
  }

This is in GameManager script:

 public bool gameFinished= false;    
  
  public void GameIsFinished()
      {
          gameisfinishedPanel.SetActive(true);
          gameFinished= true;
      }

Script with playerprefs:

     using System.Collections;
     using System.Collections.Generic;
     using UnityEngine;
     using UnityEngine.UI;
     using UnityEngine.SceneManagement;
 
 public class CheckLevelsStarts : MonoBehaviour
 {
     public Button[] levelLoaders;
     public Image[] starsOne;
     public Image[] starsTwo;
     public Image[] starsThree;
     public Image[] starsFour;
 
     private void Start()
     {
         PlayerPrefs.SetInt("Scene1stars", 3);
 
         for (int i = 0; i < levelLoaders.Length; i++)
         {
             if(i == 0)
             {
                 if(PlayerPrefs.GetInt("Scene1stars") == 0)
                 {
                     levelLoaders[i].interactable = false;
                 }
                 for (int j = 0; j < starsOne.Length; j++)
                 {
                     if (PlayerPrefs.GetInt("Scene2stars") > j)
                     {
                         starsOne[j].gameObject.SetActive(true);
                     }
                 }
             }
             if (i == 1)
             {
                 if (PlayerPrefs.GetInt("Scene2stars") == 0)
                 {
                     levelLoaders[i].interactable = false;
                 }
                 for (int j = 0; j < starsTwo.Length; j++)
                 {
                     if (PlayerPrefs.GetInt("Scene3stars") > j)
                     {
                         starsTwo[j].gameObject.SetActive(true);
                     }
                 }
             }
             if (i == 2)
             {
                 if (PlayerPrefs.GetInt("Scene3stars") == 0)
                 {
                     levelLoaders[i].interactable = false;
                     for (int j = 0; j < starsFour.Length; j++)
                     {
                         if (PlayerPrefs.GetInt("Scene4stars") > j)
                         {
                             starsThree[j].gameObject.SetActive(true);
                         }
                     }
                 }
             }
             if (i == 3)
             {
                 if (PlayerPrefs.GetInt("Scene4stars") == 0)
                 {
                     levelLoaders[i].interactable = false;
                 }
             }
         }
     }
 
     public void LoadScene1()
     {
         SceneManager.LoadScene(1);
     }
     public void LoadScene2()
     {
         SceneManager.LoadScene(2);
     }
     public void LoadScene3()
     {
         SceneManager.LoadScene(3);
     }
     public void LoadScene4()
     {
         SceneManager.LoadScene(4);
     }
 }