Data Store script not saving/loading?

I have been trying to make a script that saves/loads using Data Store.. I have made this so far...

local Store = game:GetService("DataStoreService"):GetDataStore("XP/LEVEL")

game.Players.PlayerAdded:connect(function (player)
    local playername = player.Name
    local stats = Instance.new("IntValue")
    stats.Name = "leaderstats"
    stats.Parent = player

    local xp = Instance.new("IntValue")
    local xpStats = Store:GetAsync(playername.."XP")
    xp.Name = "XP"
    xp.Value = xpStats or 0
    xp.Parent = stats

    local Level = Instance.new("IntValue")
    local xpLevel = Store:GetAsync(playername.."LEVEL")
    Level.Name = "Level"
    Level.Value = xpLevel or 1
    Level.Parent = stats
end)

game.Players.PlayerRemoving:connect(function (player)
    local playername = player.Name
    local XP = player.leaderstats:FindFirstChild("XP")
    Store:SetAsync(playername.."XP",XP.Value)

    local LEVEL = player.leaderstats:FindFirstChild("Level")
    Store:SetAsync(playername.."LEVEL", LEVEL.Value)
end)

There is no errors in the output at all. But it just doesn't seem to want to work. Did i set up the "GetAsync" and "SetAsync" correctly?