Help with resize script

I want to recreate this:
Develop a Flash game like Cirplosion – AS3 version | Emanuele Feronato

But i cant limit my resize max and min. Why?

var velicina = 10;
var minvelicina = 8;
var maxvelicina = 60;




function Update() {

if(velicina >= maxvelicina)
{

velicina=maxvelicina;


}


if(Input.GetMouseButton(0))
{

transform.localScale += Vector3(velicina,0,velicina)* Time.deltaTime;


}


}

Because you are increasing the value of scale, not the value of velicina.

You may want to do this:

var velicina = 10;
var minvelicina = 8;
var maxvelicina = 60;

function Update() {
    if(velicina >= maxvelicina)
    {
        velicina = maxvelicina;
    }   

    if( Input.GetMouseButton(0 ))
    {    
        velicina += Time.deltaTime;
        transform.localScale = Vector3(velicina,0,velicina);
    }
}