Simon Says tutorial question

Hello!

I am following a tutorial named Simon Says, http://www.youtube.com/watch?v=KSwB0N9Axp4

However I am stuck at 34-ish minutes. I have done everything the person said in the video however mine doesn't do what his does. Could anyone help me out?

(http://wtrns.fr/hdz-yb1f1aujL1c you can download my files here, I used WeTransfer).

EDIT: In the video it shows that I can now press a button, all of them should light up. however in my project it doesn't light up nor can I press on any of the 4 buttons.

Code 1 named 'SimonSays'

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 struct SimonLightPlate
 {
     public enum eType
     {
         INVALID_TYPE = -1,
         BLUE,
         GREEN,
         RED,
         YELLOW,
         NUM_TYPES
     }
     
     public SimonLightPlate( string plateName )
     {
         plate = GameObject.Find (plateName);
     }
 
     public GameObject plate; //The plate associated with the colors.
 }
 
 public class SimonSays : MonoBehaviour 
 {
     
     SimonLightPlate[] lightPlates = new SimonLightPlate[(int)SimonLightPlate.eType.NUM_TYPES];
     
     enum eState    
     {
         INVALID_STATE = -1,
         THINKING,
         DISPLAY_SEQUENCE,
         WAITING_FOR_USER,
         NUM_STATES
     }
 
     eState currentState = eState.INVALID_STATE;
     
     List<int> sequence = new List<int>(100); // hold the sequence
     int sequenceCount = 0; //The counter for which index of the sequence we're currently showing
     
     List<int> clickedSequence = new List<int>(100); 
         
     // Use this for initialization
     void Start () 
     {
         lightPlates[(int)SimonLightPlate.eType.BLUE]     = new SimonLightPlate("BluePlane");
         lightPlates[(int)SimonLightPlate.eType.GREEN]     = new SimonLightPlate("GreenPlane");
         lightPlates[(int)SimonLightPlate.eType.YELLOW]     = new SimonLightPlate("YellowPlane");
         lightPlates[(int)SimonLightPlate.eType.RED]     = new SimonLightPlate("RedPlane");
         
         
     }
     
     void OnLeftClickDown(SimonLightPlate.eType color)
     {
         lightPlates[(int)color].plate.renderer.enabled = true;
     }
     
     
     
     // Update is called once per frame
     void Update () 
     {
         
     }
     
     void ResetGame()
     {
         
     }
 }

Code 2 named 'ColorPlateClickHandler'

 using UnityEngine;
 using System.Collections;
 
 public class ColorPlateClickHandler : MonoBehaviour 
 {
     void OnMouseOver()
     {
         //Handle left mouse click.
         if (Input.GetMouseButtonDown(0))
         {
             SimonLightPlate.eType colorPlate = SimonLightPlate.eType.INVALID_TYPE;
             if (this.name ==         "BlueClickPlane")
             {
                 colorPlate = SimonLightPlate.eType.BLUE;
             }
             else if (this.name ==     "RedClickPlane")
             {
                 colorPlate = SimonLightPlate.eType.RED;
             }
             else if (this.name ==    "YellowClickPlane")
             {
                 colorPlate = SimonLightPlate.eType.YELLOW;
             }
             else if (this.name ==     "GreenClickPlane")
             {
                 colorPlate = SimonLightPlate.eType.GREEN;
             }
             
             this.SendMessageUpwards("OnLeftClickDown", colorPlate, SendMessageOptions.DontRequireReceiver);    
         }
         
     }
     
     void OnMouseUp()
     {
         if (Input.GetMouseButtonUp(0))
         {
             this.SendMessageUpwards("OnLeftClickUp", this.name, SendMessageOptions.DontRequireReceiver);
         }
     }
 }