FE completely breaks my game, how do I fix?

I am making a murder game which is coming out of Alpha, but since Experimental Mode was added and restricted any one from seeing the game unless you search it really hurt the total number of visits, so I decided to turn on FE and I knew it was going to break the game and I was right, but I have no idea why, the main script, GameScript, is a server script, and reading over the article on robloxdev.com it says that client-sided scripts do not have control. I really need help because all the remote functions and events stuff are just completely alien to me, please help! I added in a few comments to areas that might seem confusing.

game.Players.PlayerAdded:connect(function(player) --Adds stats for the player
	local q = Instance.new("IntValue")
	q.Name = "Queue"
	q.Parent = player
	local l = Instance.new("BoolValue")
	l.Name = "leaderstats"
	local lv = Instance.new("IntValue")
	lv.Name = "Level"
	lv.Value = 1
	lv.Parent = l
	local ex = Instance.new("IntValue")
	ex.Name = "XP"
	ex.Value = 0
	ex.Parent = l
	local p = Instance.new("IntValue")
	p.Name = "Points"
	p.Value = 100
	p.Parent = l
	local i = Instance.new("BoolValue")
	i.Name = "Inventory"
	i.Parent = player
	local m = Instance.new("BoolValue")
	m.Name = "Murderer"
	m.Value = "Identify"
	m.Parent = i
	
	ex.Changed:connect(function() --Handles xp
		if ex.Value>math.floor(50*(1.4^lv.Value)) then
			ex.Value = ex.Value-math.floor(50*(1.4^lv.Value))			
			lv.Value = lv.Value+1
		end
	end)
	
	l.Parent = player
end)

function applyChar(player,char) --Disguises character when game starts
	player.PlayerGui.GameGui.Spectate.Visible = false
	player.PlayerGui.ShopGUI.Open.Visible = false
	player.PlayerGui.ShopGUI.Shop.Visible = false
	for _,e in ipairs(player.Character:GetChildren()) do
		if e.className=="Accessory" or e.className=="Shirt" or e.className=="Pants" or e.className=="CharacterMesh" then
			e:Remove()
		end
	end
	for _,e in ipairs(char:GetChildren()) do
		if e.Name=="Head" then
			local h2 = e:Clone()
			h2.Anchored = false
			h2.Name = "Head2"
			player.Character.Head.Transparency = 1
			Instance.new("Weld").Parent = h2
			h2.Weld.Part0 = player.Character.Head
			h2.Weld.Part1 = h2
			h2.Parent = player.Character
			if h2:FindFirstChild("face")~=nil then
				player.Character.Head.face.Texture = h2.face.Texture
				h2.face:Remove()
			end
			player.Character.Torso.BrickColor = h2.BrickColor
			player.Character["Right Arm"].BrickColor = h2.BrickColor
			player.Character["Left Arm"].BrickColor = h2.BrickColor
			player.Character["Right Leg"].BrickColor = h2.BrickColor
			player.Character["Left Leg"].BrickColor = h2.BrickColor
			if char.Name=="Keith" then
				h2.BrickColor = BrickColor.new("Pastel brown")
			end
			script.NameGui:Clone().Parent = h2
			h2.NameGui.Display.Text = char.Name
			h2.NameGui.Display.Visible = true
			h2.NameGui.PlayerToHideFrom = player
			player.PlayerGui.GameGui.NameGui.CharN.Text = char.Name
			player.PlayerGui.GameGui.NameGui.CharN.Visible = true
			player.PlayerGui.GameGui.NameGui.Display.Visible = true
			local nt = Instance.new("StringValue")
			nt.Value = char.Name
			nt.Name = "CharName"
			nt.Parent = player.Character.Humanoid
		elseif e.Name=="Handle" then
			local hat = Instance.new("Hat")
			hat.AttachmentPoint = e.CFrame:inverse()*(char.Head.CFrame*CFrame.new(0,0.5,0))
			e:Clone().Parent = hat
			hat.Handle.FormFactor = "Custom"
			hat.Handle.Size = Vector3.new(0.2,0.2,0.2)
			hat.Handle.Anchored = false
			hat.Parent = player.Character
		else
			e:Clone().Parent = player.Character
		end
	end
	script.OnDeath:Clone().Parent = player.Character
	player.Character.OnDeath.Disabled = false
end


function msgAll(txt) --Uses gui to message players about game status (countdown, not enough players, etc.)
	for _,p in ipairs(game.Players:GetChildren()) do
		if p:FindFirstChild("PlayerGui")~=nil and p.PlayerGui:FindFirstChild("GameGui")~=nil then
			p.PlayerGui.GameGui.Top.Text = txt
		end
	end
end

function getStatus(player)
	if player.Character~=nil and player.Character:FindFirstChild("Humanoid")~=nil and player.Character.Humanoid.Health>0 then
		return true,player.Character.Humanoid
	else
		return false,nil
	end
end

while true do
	workspace.Map:ClearAllChildren()	
	
	for i=30,1,-1 do
		msgAll("Intermission: "..i)
		wait(1)
	end
	
	if #(game.Players:GetChildren())<3 then
		msgAll("Game needs at least 3 players...")
		while #(game.Players:GetChildren())<3 do
			local p = game.Players.PlayerAdded:wait()
			wait(1)
			if p.Character==nil then
				p.CharacterAdded:wait()
			end
		end
	end
	
	local map = (game.ReplicatedStorage.Maps:GetChildren())[math.random(1,#(game.ReplicatedStorage.Maps:GetChildren()))]:Clone()
	map.Parent = workspace.Map
	local spwn = map.Spawn:GetChildren()
	
	msgAll("")
	
	wait(2)
	
	local p = game.Players:GetChildren()
	local mdrr = 1
	for i=1,#p do
		p[i].Queue.Value = p[i].Queue.Value+1
		if p[i].Queue.Value>p[mdrr].Queue.Value then
			mdrr = i
		end
	end
	
	local s = {}
	for i=1,#p do if i~=mdrr then s[#s+1] = p[i] end end
	local sherrif = s[math.random(1,#s)]
	local mName = p[mdrr].Name
	
	local chars = game.ReplicatedStorage.Characters:GetChildren()
	local open = {}
	for i=1, #chars do open[i] = i end	
	
	for n,player in pairs(p) do
		if player:FindFirstChild("PlayerGui")~=nil and player.PlayerGui:FindFirstChild("GameGui")~=nil then
			local ran = math.random(1,#open)
			applyChar(player,chars[open[ran]])
			if n==mdrr then
				game.ReplicatedStorage.NewRound:FireClient(player,2)
				local tag = Instance.new("BoolValue")
				tag.Name = "Murderer"
				tag.Parent = player.Character.Humanoid
				player.Queue.Value = 0
			elseif p[n]==sherrif then
				game.ReplicatedStorage.NewRound:FireClient(player,1)
				local tag = Instance.new("BoolValue")
				tag.Name = "Cop"
				tag.Parent = player.Character.Humanoid
			else
				game.ReplicatedStorage.NewRound:FireClient(player,0)
			end
			player.Character:MoveTo(spwn[math.random(1,#spwn)].Position)
			table.remove(open,ran)
		end
	end
	
	local playersAlive = 0
	local murdererAlive = false
	local timeLeft = 150
	local kills = 0	
	
	for _,p in pairs(game.Players:GetChildren()) do
		if p.Character~=nil and p.Character:FindFirstChild("Humanoid")~=nil then
			p.Character.Humanoid.Died:connect(function()
				kills = kills+1
				timeLeft = timeLeft+20
				if timeLeft>100 then timeLeft=150 end
			end)
		end
	end
	
	wait(10)
	
	repeat 
		murdererAlive = false
		playersAlive = 0
		for _,player in ipairs(game.Players:GetChildren()) do
			local isAlive,hum = getStatus(player)
			if isAlive then
				if hum:FindFirstChild("Murderer")~=nil then
					murdererAlive = true
				elseif hum:FindFirstChild("CharName") then
					playersAlive =  playersAlive+1
				end
			end
		end
		wait(1)
		timeLeft = timeLeft-1
		game.ReplicatedStorage.TimeUpdate:FireAllClients("Time Left: "..tostring(timeLeft))
	until playersAlive<=0 or not murdererAlive or timeLeft<=0
	print(murdererAlive,playersAlive)

	local msg,type,cnd
	
	if murdererAlive and playersAlive>0 then
		msg = "OUT OF TIME"
		cnd = 1
	elseif murdererAlive and playersAlive<=0 then
		msg = "THE MURDERER WINS"
		cnd = 2
	elseif not murdererAlive and playersAlive>0 then
		msg = "INNOCENTS WIN"
		cnd = 3
	else
		msg = "NO SURVIVORS"
		cnd = 4
	end
	
	if cnd==1 or cnd==3 then
		for _,p in ipairs(game.Players:GetChildren()) do
			if p.Character~=nil and p.Character:FindFirstChild("Humanoid")~=nil and p.Character.Humanoid:FindFirstChild("CharName")~=nil and p.Character.Humanoid.Health>0 then
				p.leaderstats.Points.Value = p.leaderstats.Points.Value+3
				p.leaderstats.XP.Value = p.leaderstats.XP.Value+5
			end
		end
		if game.Players:FindFirstChild(script.Sheriff.Value)~=nil then
			game.Players[script.Sheriff.Value].leaderstats.XP.Value = game.Players[script.Sheriff.Value].leaderstats.XP.Value+3
			game.Players[script.Sheriff.Value].leaderstats.Points.Value = game.Players[script.Sheriff.Value].leaderstats.Points.Value+2
		end
		if game.Players:FindFirstChild(mName)~=nil then
			game.Players[mName].leaderstats.Points.Value = game.Players[mName].leaderstats.Points.Value + ((cnd==1 and kills) or math.floor(kills/2))			
			game.Players[mName].leaderstats.XP.Value = game.Players[mName].leaderstats.XP.Value + ((cnd==1 and kills) or math.floor(kills/3))
		end
		game.ReplicatedStorage.EndRound:FireAllClients(msg,0,playersAlive,"+5 for survivors","+3 for sheriff","+"..tostring((cnd==1 and kills) or math.floor(kills/3)).." for murderer",mName,script.Sheriff.Value)
	elseif cnd==2 then
		if game.Players:FindFirstChild(mName)~=nil then
			game.Players[mName].leaderstats.Points.Value = game.Players[mName].leaderstats.Points.Value+(kills*1)
			game.Players[mName].leaderstats.XP.Value = game.Players[mName].leaderstats.XP.Value+(kills*2)
		end
		game.ReplicatedStorage.EndRound:FireAllClients(msg,1,0,"+"..(kills*2).." for murderer","","",mName,script.Sheriff.Value)
	end
	
	wait(6)
	
	for _,p in ipairs(game.Players:GetChildren()) do
		if p.Character==nil or p.Character:FindFirstChild("Humanoid")==nil or p.Character.Humanoid:FindFirstChild("CharName")~=nil then
			p:LoadCharacter()
		end
	end
	
end

The magical mystical world of: Remote Events.

You need to learn how to use remote events. Remote events will allow you to make changes without the server blocking them. Remote functions will also help with that.

You need to learn how to use remote events. Remote events will allow you to make changes without the server blocking them. Remote functions will also help with that.