Hi I'm facing the problem of making a script that the player need to kill all of the enemies in in every waves before the player could automatic move to the next scene. Since the code that I have I could only kill one of the enemy and it move to the next scene instead of need to kill all of enemies. So how do I create the connection between the SpawnManager so that the player can kill all of the enemy in the waves and then progress to the next level instead on kill one and progress.

GameController

 [SerializeField] Button newGameButton = default;
 [SerializeField] Button quitGameButton = default;
 [SerializeField] Canvas theMainMenu = default;
 public static GameController gameController;
 public int playerHP;
 public int playerScore;

   
 private void Awake()
 {
     if (gameController == null)
     {
         DontDestroyOnLoad(gameObject);
         gameController = this;
     }
     else if (gameController != this)
     {
         Destroy(gameController);
     }

     newGameButton.onClick.AddListener(StartNewGame);
     quitGameButton.onClick.AddListener(QuitGame);
 }


 private void StartNewGame()
 {
     theMainMenu.gameObject.SetActive(false);
     SceneManager.LoadScene(1);

 }

 private void QuitGame()
 {
     Application.Quit();

if (UNITY_EDITOR)

    UnityEditor.EditorApplication.isPlaying = false;
     return;

endif

}

 public void RestartLevel()
 {
     playerHP = 100;
     SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);

 }

 public void LoadLevel()
 {
    
     int currentSceneIndex = SceneManager.GetActiveScene().buildIndex;

     if (currentSceneIndex == 3)
         currentSceneIndex = 0;
     else
         currentSceneIndex++;

     SceneManager.LoadScene(currentSceneIndex);
 }

}

SpawnManager

 [SerializeField] int numberOfEnemies;  
 private GameObject ourPlayer;
 private PlayerHud ourHudScript;
 public GameObject ourEnemy;
 
 private int score = 0;  //beginning score 
 public int waveCount = 1; // beginning wave


 List<GameObject> enemies;  // list to hold enemies
 public int deadEnemy = 0;  // list to hold dead enemies
 [SerializeField] List<GameObject> enemyStart = default;


 void Start()
 {
     //Get (or find) a reference to the player so we can tell the HUD how many enemies are needed to progress the wave
     ourPlayer = GameObject.FindGameObjectWithTag("Player");
     ourHudScript = ourPlayer.GetComponentInChildren<PlayerHud>();

     enemies = new List<GameObject>(); //create list to hold enemies and instantiate them into the scene upon start


     spawnEnemies(numberOfEnemies);  //spawn enemies based on the number of enemies

     ourHudScript.ShowScore(score, numberOfEnemies);  //present score to hud on start
     ourHudScript.ShowWave(waveCount);  //present waveCount to HUD


 }
 public void RemoveEnemy(GameObject deadEnemy)  //remove enemies if destroyed and increment the kill counter
 {
     score++;  //increment score
     Destroy(deadEnemy);  //destroy enemy
     enemies.Remove(deadEnemy);  //bring out your dead
     //this.deadEnemy++;  //specify the dead to remove

     if (score == numberOfEnemies)
         waveCount++;

     
     ourHudScript.ShowScore(score, numberOfEnemies);  //show score on screen
     ManageWaves();  //manage the waves
 }

 private void ManageWaves()  //wave manager
 {
     

     if (deadEnemy == 3)  //if the dead enemies = 3
     {
         waveCount++;  //increase the wave count by 1
         numberOfEnemies = (4); //set the text for number of enemies to kill to 4
         spawnEnemies(4);  //increase the starting enemy number (3) by 1.. to (4)
         score = 0;  //reset current score to 0
         ourHudScript.ShowWave(waveCount);  //display the wave count

     }
     else if (deadEnemy == 7)  //if the dead enemies = 7
     {
         waveCount++;  //increase the wave count by 1
         numberOfEnemies = (5);  //set the text for number of enemies to kill to 5
         spawnEnemies(5);  //increase the starting enemy number of the previous itteration (4) by 1.. to (5)
         score = 0;  //reset current score to 0
         ourHudScript.ShowWave(waveCount);  //display the wave count
     }
     else if (deadEnemy == 12)
     {
         //display you win text  winText.text
     }

     GameController.gameController.LoadLevel();
 }

 private void spawnEnemies(int numEnemy)  //spawn enemy army
 {
     for (int i = 0; i < numEnemy; i++)  //iterate enemy count by 1 each time
     {
         enemies.Add(Instantiate(ourEnemy, enemyStart[i].transform.position, enemyStart[i].transform.rotation));  //instantiate enemies and set their direction
     }
 }

}

PlayerHud

 public Canvas ourCanvas;
 public Text ammoText;
 public Text useText;
 public Text lootText;
 public Text healthText;
 public Image screenOverlay;
 public string displayText = "";
 public Text waveText;
 public Text scoreText;
 public SpawnManager ourSM;

 private PlayerController ourPC;


 //set items that should function on start
 void Start()
 {       
     ourPC = GetComponentInParent<PlayerController>();
     //ourSM = GetComponentInParent<SpawnManager>();
     useText.gameObject.SetActive(false);
     lootText.gameObject.SetActive(false);
     screenOverlay.gameObject.SetActive(false);

 }

 
 void Update()
 {
     ammoText.text = "Ammo : " + ourPC.ammoCount + " / 100";  //update ammo amount for player
     healthText.text = "Health : " + GameController.gameController.playerHP;  //update health for player
     waveText.text = "Wave : " + ourSM;

     if (ourPC.showUse)  //display usable items
         ShowTheUseTip(true);
     else
         ShowTheUseTip(false);

     if (ourPC.isDead)  //display red screen of death if player is dead
     {
         screenOverlay.color = new Vector4(1f, 0f, 0f, 0.5f);
         screenOverlay.gameObject.SetActive(true);
     }
     else  //otherwise set the activity of the screen overlay to !active
     {

         screenOverlay.gameObject.SetActive(false);
     }
 }

 private void ShowTheUseTip(bool value)  //is the object active yes/no
 {
     useText.text = displayText;  //display text
     useText.gameObject.SetActive(value);  //set text as active

 }

 public void DisplayTheLoot(string theText)  //display the loot text
 {
     StartCoroutine(DisplayLoot(theText));
 }

 IEnumerator DisplayLoot(string theText)  //loot the loot
 {
     lootText.text = theText;  //link to loot text

     lootText.gameObject.SetActive(true);  //set text as active
     yield return new WaitForSeconds(5f);  //
     lootText.gameObject.SetActive(false); //make text disappear after xx sec

 }
 public void ShowScore(int score, int outOf)  //update the scoreText when an enemy is removed
 {
     scoreText.text = "Score : " + score.ToString() + "/" + outOf.ToString();  //set the score information from the spawn manager

 }
 public void ShowWave(int wave)  //update the scoreText when an enemy is removed
 {
     waveText.text = "Wave : " + wave.ToString() + "/" + "3";  //set the score information from the wave manager inside the wave manager

 }

}