DontDestroyOnLoad not working

I have a button in my game that allows the player to go back to the title screen mid-game. In order to save the score in such an occurrence, I put the score in the following class:

 using UnityEngine;
 using System.Collections;
 
 public class Score : MonoBehaviour {
 
     // This class contains the score and saving variables.
 
     public int intScore;
     public float decScore;
     public bool keepScore; // This is to determine whether to keep or throw out the old score upon starting the game.
 
     void Awake () {
         DontDestroyOnLoad(this); // This makes sure the score stays as long as the app is open
         if (FindObjectsOfType(GetType()).Length > 1)
         {
             Destroy(gameObject);
         }
     }
 }

The intention is that a false value in keepScore indicates that the game is over and thus the score should not be kept, whereas a true value indicates that the game is in progress and thus the score should be kept. When the game ends, the value is set to false with a simple

 score.keepScore = false;

(I am accessing it from another class) and when the game is in progress but the title screen is available to be selected the value is set to true with

 score.keepScore = true;

However, when I go back to the title screen using the following code:

         if (Input.touchCount == 1 && touched == false)
         {
             Application.LoadLevel("StartScreen");
         }

and then return to the game, the value is always false, even if I had set it to true. What am I doing wrong?