My timer is not slowing down why?

hello, I have build a timer with a cutout it works perfect but if i want to slow it down it wont work here is my script:

 #pragma strict
 
     var speed: float;
     var rend: Renderer;
     var control: controller;
     var mkam: GameObject;
     var speeder: float;
     var revealOffset: float;
     
     var lastlvl: float;
 
 function Start () {
     control = mkam.GetComponent("controller");
     lastlvl = 1;
 }
 
 function Update () {
     speeder = 0.0001 * control.curscore;
 
     revealOffset = rend.material.GetFloat("_Cutoff") + speed + speeder; 
             
     rend.material.SetFloat ("_Cutoff", revealOffset);
     
     if(lastlvl != control.curlevel) {
     
          speeder = speeder - 0.001;
         lastlvl = control.curlevel;
         
     }
     
 }

the script is checking if your level up if that is so that the line "speeder = speeder - 0.001" is runnng this is where its going wrong.

thank you for lokking and helping

Rick Grendel