LocalScript working on Solo mode, but not Play mode?

It's supposed to be a top-down view camera. It's a localscript in StarterPack. The problem is it works in Play Solo mode, but not Play mode (normal mode.) Here's the script:

local Camera = game.Workspace.CurrentCamera
local Torso = game.Players.LocalPlayer.Character.Torso
Camera.CameraType = "Scriptable"
Camera.CameraSubject = nil

repeat wait() until game.Players.LocalPlayer:FindFirstChild("PlayerGui")

local Player = game.Players.LocalPlayer
local size = Instance.new("ScreenGui", Player.PlayerGui)
size.Name = "Size"

local TMaxHeight = 200
local TMinHeight = 10
local TStep = 2.5
local THeight = 20

local Keys = {}

local Mouse = Player:GetMouse()
local mouse = Mouse

local dir = 0

-- USED KEYS SO FAR
-- E,Q,R,X

local Keys = {}

local Locked = false
local MouseTrack = false

function GetRotation(Unit)

        --// Cosine in radian circle: y/x so angle alpha is cos-1(y/x) x=1
        --// Problem here is the circle itself as they have 2 solutions.
        local AbZ, AbX = math.abs(Unit.z), math.abs(Unit.x)
        local Real = math.atan(AbX/AbZ)
        --// ^ugly, super, super, ugly...
        --// Now find the quadrant
        local Plus = 0
        --// Cases are Z and X
        if Unit.z >= 0 and Unit.x >= 0 then 
            --Plus = 0
        elseif Unit.z >= 0 and Unit.x < 0 then 
            Plus = (0.5 * math.pi)
            Real = ((math.pi *1.5) - Real)
        elseif Unit.z < 0 and Unit.x < 0 then 
            Plus = math.pi
        elseif Unit.z < 0 and Unit.x >= 0 then
            Plus = math.pi * 1.5
            Real = ((math.pi * 1.5) - Real)
        end
        return Real + Plus
end     

function Update()
    if not Locked and not Button2Down then
    if Keys["e"] then -- turn right
        dir = dir + 1
    end
    if Keys["q"] then -- turn left
        dir = dir - 1
    end
    if Keys["x"] then
        dir = math.deg(GetRotation(Torso.CFrame.lookVector)) - 90
    end
    end
    if not Button2Down then
    if not Locked and not MouseTrack then

    elseif MouseTrack then
        local Size = Player.PlayerGui.Size.AbsoluteSize.X / 2
        local Pos = mouse.X
        local Diff = 0
        if math.abs(Size - Pos) > Size / 20 then
        local this = ((Size - Pos) / (Size))
        local mul = (this < 0 and -1) or 1      
        Diff = math.sqrt(math.abs(this)) * 3 * mul
        end
        dir = dir + Diff
    else 
        dir = math.deg(GetRotation(Torso.CFrame.lookVector)) - 90
    end
    end
local rot = math.rad(dir)
local x = -math.cos(rot)
local z = math.sin(rot)
local New = Vector3.new(x,0,z) / 1000
local this = (mouse.hit.p - Torso.Position ).unit
Camera.CoordinateFrame = CFrame.new(Vector3.new(Torso.Position.x, Torso.Position.y + THeight, Torso.Position.z) + New , Torso.Position)
Camera:SetRoll(math.rad(dir))
end


game:GetService("RunService").RenderStepped:connect(function()
Update()
end)

function Zoom(TStep)
    THeight = ((THeight + TStep <= TMaxHeight and THeight + TStep >= TMinHeight) and THeight + TStep) or THeight
end

mouse.WheelBackward:connect(function()
    Zoom(TStep)
end)

mouse.WheelForward:connect(function() Zoom(-TStep) end)

mouse.KeyDown:connect(function(key)
    if key == "r" then
        Locked = not Locked
        if Locked then
        MouseTrack = false
        end
    elseif key == "f" then
        MouseTrack = not MouseTrack
        if MouseTrack then
            Locked = false
        end
    end
    Keys[key] = true
end)
mouse.KeyUp:connect(function(key)
    Keys[key] = false
end)

Thanks!