I want to fire an event when a part is clicked, without a ClickDetector, how can I?

So i want to run a function when a part is clicked, but i didn't use ClickDetector because.. they're outdated and no one uses them and they also don't work. So what i did was when the player had their mouse over on it, and he/she clicked on it it would open a GUI.

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I wrote the script in a GUI in a LocalScript and here's what i wrote:

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()

Mouse.Button1Down:Connect(function()
    if Mouse.Target == "ClickerForPlanet" then
        script.Parent.Menu.Visible = true
    end     
    if Mouse.Target == "ClickerForPlanet2" then
        if workspace.ClickerForPlanet2.PlanetPurchased.Value == true then
            script.Parent.Menu2.Visible = true
        end         
    end
end)    

A similar script that i tried was:

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()

Mouse.Button1Down:Connect(function()
    if Mouse.Target == worksapce.ClickerForPlanet then
        script.Parent.Menu.Visible = true
    end     
    if Mouse.Target == worksapce.ClickerForPlanet then
        if workspace.ClickerForPlanet2.PlanetPurchased.Value == true then
            script.Parent.Menu2.Visible = true
        end         
    end
end)

--NOTE--
--The ClickerForPlanet is a part, not a ClickDetector.
------------ 

I tried both of them, and none of them worked. What can i do?? I'll take any answer.

Thank you so much for helping! ~Chez_Guy :)

IF YOU HAVE A SHORT ANSWER, PLEASE FILL IT IN AS AN ANSWER, NOT COMMENT!