Checkpoint with PlayerPrefs

I'm planning to make the Checkpoint with PlayerPrefs. Could it work ? and how to make it When you load from menu scene or the player has died, it will check / load your last progress (died enemies, collected potions, where are you now / last checkpoint and other stuffs to save) with PlayerPrefs.GetInt? and when you exit this game, it will save all your progress.

i really puzzled with this script. Please help me. thanks

here's my checkpoint script

 var initCheckPoint : Checkpoint;
 var checkPointState : int = 0;
 var sfx : AudioClip;
 static var currentCheckPoint : Checkpoint;
 private var emitterActive : ParticleEmitter;
 private var emitterInactive : ParticleEmitter;
 private var hint : GameObject;
 
 function Start(){
     checkPointState = 0; // i should use PlayerPrefs.GetInt("lv1");
     hint = GameObject.Find("Text");
     currentCheckPoint = initCheckPoint;
     if (currentCheckPoint == this) Activate();
 }
 
 function OnTriggerEnter(col:Collider){
     if(col.gameObject.tag == "Player" && currentCheckPoint != this){
         currentCheckPoint.Deactivate();
         currentCheckPoint = this;
         Activate();
     }
 }
 
 function Activate(){
     emitterActive.emit = true;
     emitterInactive.emit = false;
     ShowHint();
 }
 
 function Deactivate(){
     emitterActive.emit = false;
     emitterInactive.emit = true;
 }
 
 function ShowHint(){
     hint.guiText.enabled = true;
     hint.guiText.text = "CheckPoint Reached";
     yield new WaitForSeconds (3.0);
     hint.guiText.material.color = Color.white;
     yield;
     hint.guiText.enabled = false;
 }