PassCode Gui does not work?

Hi there, I was making a Passcode GUI in my place and it seems that it does not work. The problem is that, It won't tell whether the Passcode is right or wrong and if the Passcode is correct, It won't remove the GUI. This script is placed in the StarterPack inside no Model or Part.

code = "EnterCodeHere"
Player = script.Parent.Parent.PlayerGui
Mouse = Player:GetMouse()
codegui = Player.PassCodeGUI
codeteller = codegui.PassCode.PassCodeTeller
codetype = codegui.PassCodeHere

function onKeyDown()
local key = key.lower()
    if key:byte() == 13 then -- From this part it stops working.
        if (codetype.Text == code) then 
            codeteller.Text = "Correct"
            wait(2)
            script.Parent.Parent.Character.Humanoid.WalkSpeed = 16
            codegui:remove()
        else
            codeteller.Text = "Wrong"
            wait(3)
            codeteller.Text = "Enter Passcode"
        end
    end
end
Mouse.KeyDown:connect(onKeyDown) 

This Script is a LocalScript. There are 3 frames. One is BackGround, Credits and PassCode. There is a NormalScript which makes the GUI visible.

First off localscripts will not work unless they are in the Player by one of three ways:

1. In the player's backpack
2. In the player's character
3. In the player's PlayerGui.

Now how are you accessing the player's PlayerGui in line 2 if the script is in Workspace? Also you cant use :GetMouse() on the player's PlayerGui, you have to use it on the parent. Mouse = Player.Parent:GetMouse()