Player Destroy on Collision?

Hey Unity Answers, Im Creating a 2D Maze Game to Get used to Javascript. The Concept of the Game is navigate through the maze without touching the edges, i've tried a few "OnCollisionEnter" scripts and it doesnt work Here's a Screen shot of my level

I Want it so if he touches the out side it destroys the player the boundaries are made out of cubes here's the scene hierarchy

if anyone would write me a script to try or tell me how to do it!