added buttons to pause menu

Assets/Scripts/StateController.cs

@@ -16,6 +16,12 @@ public class StateController : MonoBehaviour {
     public GameObject pauseMenuCanvas;
 
     void Awake() {
+        // check to see if a state controller already exists
+        if (GameObject.FindGameObjectWithTag("StateController") != null) {
+            Destroy(this.gameObject);
+        } else { // if it doesn't, then this is the only one
+            this.gameObject.tag = "StateController";
+        }
         DontDestroyOnLoad(this.gameObject);
         SceneManager.sceneLoaded += OnSceneLoaded;
     }
@@ -30,9 +36,15 @@ public class StateController : MonoBehaviour {
 
         pauseMenuCanvas = GameObject.Find("PauseMenuCanvas");
         if (pauseMenuCanvas != null) {
+            Button resumeButton = GameObject.Find("ResumeButton").GetComponent<Button>();
+            resumeButton.onClick.AddListener(Unpause);
             TogglePauseMenu(false);
         }
 
+        if (isPaused) {
+            Unpause();
+        }
+
     }
 
     void OnPause() {
@@ -46,6 +58,12 @@ public class StateController : MonoBehaviour {
         isPaused = !isPaused;
     }
 
+    public void Unpause() {
+        Time.timeScale = 1;
+        TogglePauseMenu(false);
+        isPaused = !isPaused;
+    }
+
     void TogglePauseMenu(bool showPauseMenu) {
         pauseMenuCanvas.SetActive(showPauseMenu);
     }