2D Collision detection to load level.

Hey I have a character hitting an area which loads the next level the code is below but I am unable to get it working I can't see what I am missing.

I need to add a delay of a couple of seconds to show the particles and a graphic saying level complete.

Here is the code, any help would be amazing :)

using System.Collections;

public class LevelLoader : MonoBehaviour {

 private bool playerInzone;

 public string LoadLevel;

 // Use this for initialization
 void Start () {
     playerInzone = false;
 
 }
 
 // Update is called once per frame
 void Update () {
 if(Input.GetKeyDown(KeyCode.W)&& playerInzone)
     {
         Application.LoadLevel("Level1");
     }
 }

     void OnTriggerEnter2D(Collider2D other)
     {
     if(other.tag == "Tipper")
         {
             playerInzone = true;
         }
     //    ... and Play the particle system
     particleSystem.Play();

     }

     void OnTriggerExit2D(Collider2D other)
     {
     if(other.tag == "Tipper")
         {
             playerInzone = false;
         }
     }

}