private void StartGame()
{
foreach (EnemyController e in enemyControllers)
{
if (e == null)
{
continue;
}
Destroy(e.gameObject);
}
enemyControllers = new List <EnemyController>();
waveManager.Reset();
playerController.Activate(true);
cameraManager.Activate(true);
waveManager.Activate(true);
}