Double Jump Script not working?

my goal was to create a code that would allow a player to double jump, but it didnt end up working. Any ideas? THANKS.

while workspace.Gamestart == true do
local FirstJump = false
local MidJump = false
local Mouse = script.Parent.Parent:GetMouse()

function onKeyDown(key)
	if string.byte(key) == 32 and FirstJump == true and (MidJump == false or script.Creative.Value == true) then
		MidJump = true
		script.Parent.Parent.Character.Torso.Velocity = Vector3.new(0,50,0)
	end
end

function Update()
	if script.Parent.Parent.Character.Humanoid.Jump == true then
		FirstJump = true
	else
		FirstJump = false
		MidJump = false
	end
end

Mouse.KeyDown:connect(onKeyDown)
script.Parent.Parent.Character.Humanoid.Changed:connect(Update)
end

If you don't find a solution here is a script

Make a localscript in StarterPack, and insert this into the localscript, then insert a Boolvalue into the localscript and name it "Jump" leave the boolvalue unchecked

I hope this helped!

repeat wait() until game:GetService("Players")
local Player = game.Players.LocalPlayer

repeat wait() until Player

local FirstJump = false
local MidJump = false
local Mouse = Player:GetMouse()
bruh = false
function onKeyDown(key)
if string.byte(key) == 32 and FirstJump == true and not bruh and (MidJump == false or script.Jump.Value == true) then
bruh= true
MidJump = true
Player.Character.Torso.Velocity = Vector3.new(0,50,0) -- Change here to change how high you jump, 
Player.Character.Humanoid.WalkSpeed = 16
wait(1.1)
bruh = false
end
end

-- Please do not change below
function Update()
if Player.Character.Humanoid.Jump == true then
FirstJump = true
else
FirstJump = false
MidJump = false
Player.Character.Humanoid.WalkSpeed = 16
end
end

Mouse.KeyDown:connect(onKeyDown)
Player.Character.Humanoid.Changed:connect(Update)