I'm having trouble with Instance.new. Why is this code not creating the Int Value?

I'm trying to make a health bar while not using the player's actual health. I'm trying to use an Integer Value to replace the player's health. This is my code but it seems that the Instance.new isn't working.

wait(1)

--Variables
local player = game.Players.LocalPlayer
local character = player.Character
local humanoid = character.Humanoid
local hpBar = script.Parent.Bar



--Functions
game.Players.PlayerAdded:Connect(function()
    local health = Instance.new("IntValue")
    health.Name = "Health"
    health.Parent = player
    health.Value = 100
end)

function Update()
    local hp = player.Health.Value / 100 - 0.02
    if hp > 2 then
        hpBar:TweenSize(UDim2.new(hp, 0, 0.85, 0))
    else
        humanoid.Health = 0
    end
end

Update()

player.Health.Changed:Connect(Update)