Starting the game from Main Menu not working with OnMouseEnter

I have 2 scenes. One is "Main Menu", consisting in a black image and a text ( they are independent one from another, in other words, they are 2 components ), and the other one is "Game". The text in the Main Menu is "START". To this text, I attached this script:

Code (CSharp):

1. public class Start_Script : MonoBehaviour {
2.     void OnMouseEnter()
3.     {
4.         Application.LoadLevel ("Game");
5.     }
6.     void Update()
7.     {
8.         if(Input.GetKey(KeyCode.Escape))
9.         {
10.             Application.Quit();
11.         }
12.     }
13. }

But when I click the text, nothing happens. How can I fix this? Thanks, guys.

 

If you are using UI, i suggest you to use eventtrigger system.
http://docs.unity3d.com/ScriptReference/EventSystems.EventTrigger.html

 

I'm not managing to make it work, man...Help me out here