Will this work?

local ds=game:GetService("DataStoreService"):GetGlobalDataStore()

local players={ }
local lastPlayerId=nil
local lastPlrStats={ }
local lastPlrName=nil
local guy=nil

game.Players.PlayerAdded:connect(function(plr)
    local stats=Instance.new("IntValue")
    stats.Name="Stats"
    stats.Parent=plr

    local kills=Instance.new("IntValue")
    kills.Name="Kills"
    kills.Parent=stats

    local deaths=Instance.new("IntValue")
    deaths.Name="Deaths"
    deaths.Parent=stats

    local wins=Instance.new("IntValue")
    wins.Name="Wins"
    wins.Parent=stats

    if ds:GetAsync(plr.userId.."Stats")~=nil then
        local userstats=ds:GetAsync(plr.userId.."Stats")
        kills.Value=userstats[1]
        deaths.Value=userstats[2]
        wins.Value=userstats[3]
    end
end)

game.Players.PlayerRemoving:connect(function(plr)
    ds:SetAsync(plr.userId.."Stats",{plr.Stats.Kills,plr.Stats.Deaths,plr.Stats.Wins})
    players={ }
    for i,v in pairs(game.Players:GetChildren())do
        table.insert(players,v)
    end
    if #players==1 then
        lastPlayerName=players[1]
        lastPlayerId=players[1].userId
    else
        lastPlayerName=nil
        lastPlayerId=nil
    end
end)

game.Close:connect(function()
    ds:SetAsync(lastPlayerId.."Stats",lastPlrStats)
end)

while wait() do
    if game.Players:FindFirstChild(lastPlrName) then
        guy=game.Players[lastPlrName]
        lastPlrStats={guy.Stats.Kills.Value,guy.Stats.Deaths.Value,guy.Stats.Wins.Value}
    end
end

So I want this script to save and load, it saves after the player leaves and loads when the player enters. It is kind of overcomplicated because it needs to save the last persons stats when the game closes, so it continuously sets variables for when that person leaves.