I need some health with my health/enemy script

Hi! This was my first attempt making a sinple health/enemy script where everytime the player clicks the left mouse button, the cube loses health and then disappear when health reaches zero.

Everything works fine, except for I got some trouble adding this: - The cube respawns after 3 seconds (I tried using yield WaitForSeconds(3);, but with no luck) - Everytime the cube "dies", the variable timesDead goes one up and when the cube has died 3 times, the message appears "You've killed all the enemies!". Theres only the problem that seems to after you've killed the cube and a new one disappear, the variable sets to the default zero again, except for the +1 that got addet when it died. For some reason it won't remember that the variable got updatet. Im pretty sure there is a way to store this, I just need a helping hand! :)

It's my very first script i've wrote totally by myself. You guys may think thats its nothing, but it's a big step for me! The code might be a little messy, but here we go:

 #pragma strict
     
     var health : int = 100; // The health
     var damage : int = 50; // The damage the player deals when he left clicks.
     var timesDead : int = 0;
     
     
     
     
 function Update()
 {
     
     
     if(Input.GetButtonDown("Fire1")) // Checks if player use the left mb
     {
         
         DamageDone();
         print("You damaged the enemy!"); // Prints to console that you damaged the enemy
         
         if(health <= 0) // if health is 0 or below then
         {
             print("You killed the enemy!"); // Print the enemy get killed
             timesDead++;
             Dead();
             Wait();
             
             
             
             
             
             
             if(timesDead  >= 3) // If the enemy is dead 3 times or more, print
             {
                 print("No more enemies to kill. You won!");
             
             }
             
     }   }
 }
 
 function Dead()
 {
     Destroy (gameObject);
 }
 
 
 
 function DamageDone() // the damage function
 {
     health -= damage;
 }
 
 function Wait() 
 {
     yield WaitForSeconds(1.50);
     print(Time.time);
     
     var enemy = GameObject.CreatePrimitive(PrimitiveType.Cube);
     enemy.AddComponent(enemyScript);
     
 }