void Start () {
levelManager = GameObject.FindObjectOfType<LevelManager>();
if (!levelManager) Debug.LogError ("Enemy Controller Start !levelManager");
myRenderer = GetComponent<SpriteRenderer>();
if (!myRenderer) Debug.LogError ("Enemy Controller Start !myRenderer");
insane = levelManager.insane;
armed = true;
bombSpeed = 6f;
dearmed = false;
fireDelay = 0.2f;
fireTime = Time.time;
maxHealth = 111f;
myWave = levelManager.GetWaveNumber();
// difficulty tuning: increases each wave
fireDelay = 1 / (myWave * 0.3f);
maxHealth += (myWave * 1.7f);
hitPoints = maxHealth;
}