Constant Checking System?

So, without getting too technical, i have a script that pretty much plays out the game. It starts the round when 2 or more players are within the game, a random map is chosen. Along with a Killer & Officer. The players spawn within the map. And the killer & officer also spawn but with selected weapons.

I'm currently confused on how i can make a constant checking system, so if a player leaves when the map is spawning or when everything is chosen and players are about to be spawned, something happens, to the point where there is only 1 player left. The current script i have just STOPS when a player leaves and there is only 1 player left. No errors in output.

I HAVE tried something, but it doesn't work and takes up too much space. Please help. Thanks. :)

Also, when answering please stick with answer my question. I don't need people commenting on how dreadful or sloppy my code is.

------------------------Variables-------------------------------
minigames = game.Lighting.Minigames:GetChildren() -- Minigames Variable
round = ("default") -- Round Status
OfficerWep = game.Lighting.gun1 -- Officer Weapon
HitmanWep = game.Lighting.gun2 -- Hitman Weapon
message2 = game.Workspace.LobbyModel.Partmain.SurfaceGui.main -- The main GUI
message3 = game.Workspace.LobbyModel.Partmain.SurfaceGui.timer -- The Timer GUI
HitmanGUI = game.Lighting.HitmanGui
OfficerGUI = game.Lighting.OfficerGui
local sound = Instance.new("Sound")
sound.SoundId = "http://www.roblox.com/asset/?id=130802245"
sound.Parent = game.Workspace
------------------------Main-------------------------------

 


function playMusic()
    sound:play()
	wait(10)
end

function checkPlayers()
 if game.Players.NumPlayers == 1 then
	wait(2)
   end
end



while true do
	if game.Players.NumPlayers > 1 then
     if round == ("default") then --Checks if a round has recently ended
	print("Starting default round") --This will print the first time the server is started, i think.
elseif
	round == ("over1") then
	message2.Text = ("Round will start soon")
	wait(20)
end
		sound:stop()
		checkPlayers()
		message2.Text = ("Randomly selecting map...")
		wait(3)
		---------------Random select Map-------------------------
		checkPlayers()
		ranGame = math.random(1, #minigames)
		gameChosen = minigames[ranGame]
		checkPlayers()
		message2.Text = ("Map Chosen: " ..gameChosen.Name)
		wait(3)
		gameChosenClone = gameChosen:Clone()
		gameChosenClone.Parent = game.Workspace
		checkPlayers()
		message2.Text = ("Map Chosen: " ..gameChosen.Name)
		wait(3)
		message2.Text = ("Randomly selecting Hitman & Officer...")
		checkPlayers()
		wait(2)
		---------------Random select hitman and officer----------
		checkPlayers()
		Players = game.Players:GetPlayers() -- Add all players to Plrs table
		killer = Players[math.random(1,#Players)] -- Get a player, this player is defined under Players
	    hero = Players[math.random(1,#Players)]
	---------------Checking System----------
	checkPlayers()
	if killer == hero then -- Checks if the selected killer/hero is the same, and if so changes it so its not
		repeat
		killer = Players[math.random(1,#Players)]
		wait(1)
		hero = Players[math.random(1,#Players)]
		until
		killer ~= hero
	print("The Hitman is " ..killer.Name)
	print("The Officer is " ..hero.Name)
	    wait(1)
	         end
	   round = ("starting")
	   ---------------Teleport players to selected map----------
	   spawns = gameChosenClone.Spawns:GetChildren()
	   checkPlayers()
	message2.Text = ("Round in progress...")
	for i,v in pairs(game.Players:GetPlayers()) do
		name = v.Name
		check = game.Workspace:FindFirstChild(name)
		if check then
			checkHumanoid = check:FindFirstChild("Humanoid")
			if checkHumanoid then
				check:MoveTo(spawns[i].Position)
			end
		end
	end
	   OfficerWep:Clone().Parent = hero.Backpack -- Gives the Officer Gun1
	   HitmanWep:Clone().Parent = killer.Backpack -- Gives the Hitman Gun2
	--------------Tutorial GUI---------------------
	OfficerGUI:Clone().Parent = hero.PlayerGui
	HitmanGUI:Clone().Parent = killer.PlayerGui
	wait(15)
	hero.PlayerGui.OfficerGui:Destroy()
	killer.PlayerGui.HitmanGui:Destroy()
	HeroDied()
	     else
	  playMusic()
	message2.Text = ("There needs to be more than 1 player to start")
     end
	wait(1)
end

I believe because you have it checking if it stays up to 2 or more players, if it goes below 1, it has nothing to do. If you add it so if there is ever 1 player, the game resets and it waits until another player to start up again.