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C#/FX_Destroy.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class FX_Destroy : MonoBehaviour
+{
+
+    public float m_timer = 1.0f;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+
+        Destroy(this.gameObject, m_timer);//Automatic destruction after 1s
+
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+
+    }
+}

C#/GameManager.cs

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+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.SceneManagement;
+
+[AddComponentMenu("Game/GameManager")]
+public class GameManager : MonoBehaviour
+{
+
+    public static GameManager Instance = null;
+    public static int _ammo = 1;//Type of bullets
+    //Number of pistol bullets
+    public static int n_ammo = 30;
+    //Number of machine gun bullets
+    public static int m_ammo = 100;
+
+    public Text txt_ammo01;    //Pistol ammunition text
+    public Text txt_ammo02;    //Machine gun ammunition text
+
+    public GameObject ShezhiPanel;  //Settings panel
+
+    public Button GameAgainPlayButton; //Game restart button
+    public Button GameRePlayButton;    //Game continue button
+    public Button GameQuitButton;      //Game quit button
+    public static bool MoveController = false;//Pause or not
+
+
+    Player m_player;
+
+    public int Level_num = 3;
+
+    // Use this for initialization
+    void Start()
+    {
+        MoveController = false;
+        Instance = this;
+        GameAgainPlayButton.onClick.AddListener(GameAgainPlayButtonListener);   //Add game restart button listener
+        GameRePlayButton.onClick.AddListener(GameRePlayButtonClickListener);    //Add game continue button listener
+        GameQuitButton.onClick.AddListener(GameQuitButtonClickListener);        //Add game quit button listener
+
+        //Get the player
+        m_player = GameObject.FindGameObjectWithTag("Player").GetComponent<Player>();
+    }
+
+    void Update()
+    {
+        if (Input.GetKeyDown(KeyCode.O))
+        {
+            StopButtonClickListener();
+        }
+    }
+
+    // Update ammunition
+    public void SetAmmo(int ammo)
+    {
+        if (_ammo == 1)
+        {
+            m_ammo -= ammo;
+            txt_ammo02.text = m_ammo.ToString() ;
+        }
+        else
+        {
+            n_ammo -= ammo;
+            txt_ammo01.text = n_ammo.ToString() ;
+        }  
+    }
+
+    //Reload ammunition
+    public void AddAmmo()
+    {
+        if (_ammo == 1)
+        {
+            m_ammo = 100;
+            txt_ammo02.text = m_ammo.ToString() ;
+        }
+        else
+        {
+           n_ammo = 30;
+           txt_ammo01.text = n_ammo.ToString() ;
+        }  
+    }
+
+    //Switch gun
+    public void ReAmmo()
+    {
+        if (_ammo == 1)
+        {
+            txt_ammo02.text = m_ammo.ToString() ;
+        }
+        else
+        {
+            txt_ammo01.text = n_ammo.ToString() ;
+        }
+    }
+
+    void StopButtonClickListener()
+    {
+        GameManager.MoveController = true;//Pause movement
+
+        //Unlock mouse cursor
+        Cursor.lockState = CursorLockMode.None;
+        Cursor.visible = true;
+
+        ShezhiPanel.SetActive(true);//Show pause panel
+        Time.timeScale = 0;//Game pause
+    }
+
+    void GameAgainPlayButtonListener()
+    {
+        n_ammo = 30;//Number of pistol bullets
+        m_ammo = 100;//Number of machine gun bullets
+
+        SceneManager.LoadScene(Level_num);//Restart
+        Time.timeScale = 1;//resume the game
+    }
+
+    void GameRePlayButtonClickListener()
+    {
+        n_ammo = 30;
+        m_ammo = 100;
+
+        GameManager.MoveController = false;
+        Cursor.lockState = CursorLockMode.Locked;//Lock mouse cursor
+
+        ShezhiPanel.SetActive(false);//Close pause panel
+
+        Time.timeScale = 1;
+    }
+
+    void GameQuitButtonClickListener()
+    {
+        SceneManager.LoadScene(2);
+        Time.timeScale = 1;
+    }
+
+}