Stop spawning enemies when a bool is enabled

this is my current Script:

var spawnPoints : Transform[];

var enemyPrefabs : GameObject[];

var amountEnemies = 20;

var yieldTimeMin = 2;

var yieldTimeMax = 5;

var currentEnemiesNumber : int;

var tooMuchEnemies : boolean = false;

function Update() {

 currentEnemiesNumber = GameObject.FindGameObjectsWithTag("Enemy").Length;
 
       
 if (currentEnemiesNumber >= amountEnemies)
     tooMuchEnemies = true;
     
 if(currentEnemiesNumber < amountEnemies)
     tooMuchEnemies = false;
     
     
 if(!tooMuchEnemies)
     for (i=0; i