How do I code this in a simpler way?

Hello,

So the below code works fine but I can't help thinking there must be a more efficient way of doing this. The frequency of the colour change doesn't matter atm, I just want to be able to sync it somehow with the collisions.

Many Thanks

J

using UnityEngine; using System.Collections;

 public class DestroyedByBall : MonoBehaviour 
 {
     //int count; .
     public int countStart; //everytime another collider hits this start value reduces by 1/ 
 
     void Start()
     {
         countStart =30; 
     } 
 
     void OnTriggerEnter (Collider other)
     {
 
         if (other.CompareTag ("Player")) {
             countStart-- ; //everytime another collider hits this goes up one
 
         } 
 
     if (countStart == 20) 
         {
             gameObject.transform.parent.GetComponent<Renderer> ().material.color = Color.black; 
              
         }
 
         if (countStart == 10) 
         {
             gameObject.transform.parent.GetComponent<Renderer> ().material.color = Color.yellow; 
 
         }
 
         if (countStart == 5) 
         {
             gameObject.transform.parent.GetComponent<Renderer> ().material.color = Color.red; 
 
         }
 
         if (countStart == 0) 
         {
              
             //destroys parent of gameoject ie the whole gameobject
             Destroy (transform.parent.gameObject); 
         }
     }
 
 
 
 }