void Start()
{
unitSelection = FindObjectOfType <UnitSelection>();
maxTime = maxTime / unitSelection.difficulty.towerTimeMultiplier;
canvas = unitSelection.hudCanvas.transform;
towerBars = Instantiate(towerBarsPrefab).GetComponent <TowerBars> ();
towerBars.canvasRect = canvas.GetComponent <RectTransform>();
towerBars.transform.SetParent(canvas);
towerBars.maxHealth = maxHealth;
towerBars.maxTime = maxTime;
towerBars.entity = towerBarsPosition;
health = maxHealth;
time = maxTime;
startTime = Time.time;
isAlive = true;
unitSelection.AddTower(this);
hasPlayedSFX = false;
}