Lives

//in game manager.cs
 //for lives UI
    public TextMeshProUGUI livesText;
    private int lives;

 public void UpdateLives(int livesToChange)
    {
        lives += livesToChange;
        livesText.text = "Lives " + lives;
        if(lives<= 0)
        {
            GameOver();
        }

    }

 public void StartGame(int difficulty)
    {
     //starting number of lives
        UpdateLives(5);
    }

    //In Target.cs script

     private GameManager gameManager;

      void Start()
    {
     gameManager = GameObject.Find("Game Manager").GetComponent<GameManager>();
    }

    //object hitting sensor destroys it
    //1 life is taekn away if object hits the sensor
    private void OnTriggerEnter(Collider other)
    {
        Destroy(gameObject);
        if (!gameObject.CompareTag("Bad"))
            {
            gameManager.UpdateLives(-1);
            if (gameManager.lives < 0)
                {
                gameManager.lives = 0;
                gameManager.UpdateLives(0);
                }
            }
    }