How do I scale a UI in both X axis and Y Axis?

Hi, I have been trying to figure out what's causing why it only scales on the X axis, but not both, there are no errors in the output too.

I am trying to make a healthbar that is shaped as a sphere.

Here is the script.

local healthbarr = script.Parent
local Player = game:GetService("Players").LocalPlayer

local Char = Player.Character or Player.CharacterAdded:Wait()
local huma = Char:WaitForChild("Humanoid")

local function health()
     local Ahealth = math.clamp(huma.Health / huma.MaxHealth, 0, 1)
      healthbarr.Size = UDim2.fromScale(Ahealth, 1)
end

health()

huma:GetPropertyChangedSignal("Health"):Connect(health)

huma:GetPropertyChangedSignal("MaxHealth"):Connect(health)