void Start()
    {
        healthS = new HealthSystem(100);
        HealBarM.Setup(healthS);
        sheildS = new HealthSystem(100);
        SheildBarM.Setup(sheildS);
        sheildS.Damage(10);

        gameOver          = false;
        restart           = false;
        restartText.text  = "";
        gameOverText.text = "";
        score             = 0;
        salvage           = 0;
        UpdateScore();
        StartCoroutine(SpawnWaves());
    }