added game end screen

also! the new singleton system doesn't work! returning to the main menu creates a second instance of everything, @nick can you fix this please

Assets/Scripts/DialogBoxes.cs

@@ -17,6 +17,9 @@ public class DialogBoxes : MonoBehaviour
     [SerializeField] Image backgroundImageObject;
     [SerializeField] Sprite[] images;
 
+    [Header("Buttons:")]
+    [SerializeField] GameObject backToMenuButton;
+
 
     // Start is called before the first frame update
     void Start()
@@ -37,7 +40,11 @@ public class DialogBoxes : MonoBehaviour
         }
         else
         { // no more dialog messages, advance the scene
-            SceneController.Instance.NextScene();
+            if (backToMenuButton != null) {
+                backToMenuButton.SetActive(true);
+            } else {
+                SceneController.Instance.NextScene();
+            }
         }
     }
 

Assets/Scripts/SceneController.cs

@@ -33,6 +33,15 @@ public class SceneController : MonoBehaviour
         { // if this is the menu
             GameObject.Find("NewGameButton").GetComponent<Button>().onClick.AddListener(NextScene);
         }
+
+        // if this is the last scene
+        if (scene.buildIndex == (SceneManager.sceneCountInBuildSettings - 1)) {
+            GameObject backToMenuButton = GameObject.Find("BackToMenuButton");
+            if (backToMenuButton != null) {
+                backToMenuButton.GetComponent<Button>().onClick.AddListener(delegate{LoadChosenScene(0);});
+                backToMenuButton.SetActive(false);
+            }
+        }
     }
 
     public void NextScene()