DataStores won't save player's progress?

So while I was testing my game, I noticed that these DataStores won't work. I had tested it a lot not on Studio, but with different alt. accounts for DataStore testing. Can someone tell me what's wrong with this script?

local dataStores = game:GetService("DataStoreService"):GetDataStore("BitsDataStore")
local defaultBits = 0
local playersLeft = 0

game.Players.PlayerAdded:Connect(function(player)
	
	playersLeft = playersLeft + 1
	
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player
	
	local bits = Instance.new("IntValue")
	bits.Name = "Bits"
	bits.Value = 0
	bits.Parent = leaderstats
	
	player.CharacterAdded:Connect(function(character)
		character.Humanoid.WalkSpeed = 16
		character.Humanoid.Died:Connect(function()
			-- Whenever someone dies, this event will run
			
			if character.Humanoid and character.Humanoid:FindFirstChild("creator") then
				game.ReplicatedStorage.Status.Value = tostring(character.Humanoid.creator.Value).." KILLED "..player.Name
			end
			
			if character:FindFirstChild("GameTag") then
				character.GameTag:Destroy()
			end
			
			player:LoadCharacter()
		end)
	end)
	
	-- Data stores
	
	local player_data 
	
	pcall(function()
		player_data = dataStores:GetAsync(player.UserId.."-Bits") -- 1736284-Bucks
	end)
	
	if player_data ~= nil then
		-- Player has saved data, load it in
		bits.Value = player_data
	else
		-- New player
		bits.Value = defaultBits
	end
	
end)

local bindableEvent = Instance.new("BindableEvent")

game.Players.PlayerRemoving:Connect(function(player)
	
	pcall(function()
		dataStores:SetAsync(player.UserId.."-Bits",player.leaderstats.bits.Value)
		print("Saved")
		playersLeft = playersLeft - 1
		bindableEvent:Fire()
	end)
	
end)

game:BindToClose(function()
	-- This will be triggered upon shutdown
	while playersLeft > 0 do
		bindableEvent.Event:Wait()
	end
end)