how come when your health is lowwer than 35 the script doesnt work?

heres the script when the health is lower then the lowamt (low amount) then the frsme should be visible and the sound should play

local play = game.Players.LocalPlayer

local lowamt = 35

--play.Character.Humanoid.Health.Changed:Connect(function()
 if play.Character.Humanoid.Health <= lowamt then
	script.Parent:Play()
	script.Parent.Parent.lowgui.lowhealthframe.Visible = true
	
end
--end)

but its not happening?

here

local play = game.Players.LocalPlayer

local lowamt = 35

play.Character.Humanoid.Changed:Connect(function()
 if play.Character.Humanoid.Health <= lowamt then
    script.Parent:Play()
    script.Parent.Parent.lowgui.lowhealthframe.Visible = true

end
end)