Making a high score script

im trying to make a 2d game where you collect little candies and you get points i have a point scripts and a restart script but when you die i want it to open up a scene Saying You died and it shows the highscore how would i save the score

Score script :

using UnityEngine; using System.Collections;

public class ScoreSystem : MonoBehaviour { public int Score;

 void Start ()
 {
     Score = 0;
 }

 private void OnTriggerEnter2D(Collider2D other)
 {
     if (other.tag == "Candy")
     {
         Debug.Log("Collided");
         Score += 1;
         OnGUI();
     }
 }
 void OnGUI() {
     GUI.Label(new Rect(10, 10, 100, 20), "Score: " + Score);
 }

}

Restart Script:

using System; using UnityEngine;

namespace UnityStandardAssets._2D { public class Restarter : MonoBehaviour { private void OnTriggerEnter2D(Collider2D other) { if (other.tag == "Player") { Application.LoadLevel(Application.Death); } } } }