Fix pause menu can only be displayed after game started

Assets/Game Manager/Game Manager.cs

@@ -7,6 +7,9 @@ public class GameManager : MonoBehaviour
     public static int MinautorKills = 0;
     public static int BringerOfDeathKills = 0;
 
+    // Can pause menu
+    public static bool GameStarted = false;
+
     private void Awake()
     {
         DontDestroyOnLoad(gameObject);

Assets/Player/Scripts/PlayerManager.cs

@@ -52,7 +52,7 @@ public class PlayerManager : MonoBehaviour
             ArrowFrequency = 0.5f;
         }
 
-        if (Input.GetKeyDown(KeyCode.Escape))
+        if (Input.GetKeyDown(KeyCode.Escape) && GameManager.GameStarted)
         {
             pauseMenu.SetActive(true);
             Time.timeScale = 0f;

Assets/UI/Start UI/Start UI.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections;
 using TMPro;
 using UnityEngine;
@@ -26,6 +25,7 @@ public class StartUI : MonoBehaviour
         _text.SetText("1");
         yield return new WaitForSecondsRealtime(1f);
         Time.timeScale = 1f;
+        GameManager.GameStarted = true;
         Destroy(gameObject);
     }
 }