My DataStore script wont save values! Help?

I made this datastore script but it wont save my data!

local LevelDataStore = game:GetService("DataStoreService"):GetDataStore('Level')

game.Players.PlayerAdded:connect(function(Player)
local key = 'id-'..Player.userId
local leaderstats = Instance.new("IntValue", Player)
local exp = Instance.new("IntValue", leaderstats)
leaderstats.Name = "leaderstats"
exp.Name = "EXP"

local SaveAsync = LevelDataStore:GetAsync(key)
if SaveAsync then
    exp.Value = SaveAsync[1]
else
    local ThingsToSave = {exp.Value}
    LevelDataStore:GetAsync(key, ThingsToSave)
end
end)


game.Players.PlayerRemoving:connect(function(Player)
    local key = 'id-'..Player.userId
    local SaveTable = {Player.leaderstats.EXP}
    LevelDataStore:SetAsync(key, SaveTable)
end)