I accidentally messed up a script while making an Infinite Runner, what did I do wrong?

While I was making an Undertale (Undyne Chase) Infinite Runner, when I tried to add another set of obstacles, so I decided to do some tinkering with the script, but that didn't work and ended up making other players die instantly before the tutorial and my character slower than a snail, what did I do wrong?

Tested: Through Studio & Roblox Player

Attempts: 17+

1st Possible Source Of Error:

(SeverScriptService - Script - Player Mannager):

local PlayerManager = {}
local PointsService = game:GetService("PointsService")
local Configurations = require(game.ReplicatedStorage.Configurations)

local function setupLeaderstats(player)
	local leaderstats = Instance.new("Model", player)
	leaderstats.Name = "leaderstats"
	
	local bestScore = Instance.new("IntValue", leaderstats)
	bestScore.Name = "Best Score"
	local pointHighScore = 0	
	pcall(function() 
		pointHighScore = PointsService:GetGamePointBalance(player.userId)
	end)
	bestScore.Value = pointHighScore
end

local function updateTutorial(player, currentTile)
	local tutorialToShow = Configurations.TuturialDisplayTime[currentTile]
	if tutorialToShow then
		game.ReplicatedStorage.Events.ShowTutorial:FireClient(player, tutorialToShow)
	end
end

function PlayerManager:Run(player, slotHeight)
	local manager = {}	
	
	setupLeaderstats(player)	
	
	local running = false	
	local score = Instance.new("IntValue", player)
	score.Name = "Score"	
	
	local tutorialFinished = false	
	
	local trackManager
	player.CharacterAdded:connect(function(character)
		running = true		
		game.ReplicatedStorage.Events.EnableControls:FireClient(player, true)
		
		-- Load in custom animations
		if character.Humanoid.RigType == Enum.HumanoidRigType.R6 then
			character.Animate.walk.WalkAnim.AnimationId = Configurations.WalkAnimationR6
		else
			-- both must be the same animation for R15 for some reason or else it won't work
			character.Animate.walk.WalkAnim.AnimationId = Configurations.WalkAnimationR15 
			character.Animate.run.RunAnim.AnimationId = Configurations.WalkAnimationR15
		end				
		
		-- Check if the track exists (from a previous run). If so clear it out. If not create a new folder for it
		local trackModel = game.Workspace.PlayerTracks:FindFirstChild(player.Name)
		if not trackModel then
			trackModel = Instance.new("Folder", game.Workspace.PlayerTracks)
			trackModel.Name = player.Name
		end
		
		-- Tutorial track
		local tutorialTracker = Instance.new("IntValue", player)
		tutorialTracker.Value = tutorialFinished and -1 or 1
		
		-- Initialize a new track for the player
		
		trackManager = require(script.Parent.TrackManager):NewTrack(Vector3.new(0,slotHeight,0), trackModel, tutorialTracker)		
		
		-- Place character at start of track and set walkspeed
		wait()		
		character.Humanoid.WalkSpeed = Configurations.WalkSpeed
		character.HumanoidRootPart.CFrame = CFrame.new(Vector3.new(0,slotHeight + 5,0))
		character.HumanoidRootPart.CFrame = CFrame.Angles(0, math.pi,0) * character.HumanoidRootPart.CFrame 
		  
		character:WaitForChild("Humanoid").Died:connect(function()
			running = false
			trackManager:Clear()
		end)		
		
		
		
		local currentTile, lastTile
		local tutorialTilesDone = 0
		local lastPosition = character.HumanoidRootPart.Position
		local distanceRan = 0
		-- Run loop

		while running do
			if player.Character and character:FindFirstChild("HumanoidRootPart") then
				if character.HumanoidRootPart.Position.Y < slotHeight - 10 then
					character.Humanoid.Health = 0
				else
					-- Update distance ran
					local currentPosition = player.Character.HumanoidRootPart.Position	
					local toCurrent = player.Character.HumanoidRootPart.CFrame:vectorToObjectSpace(currentPosition - lastPosition)
					distanceRan = distanceRan + math.abs(toCurrent.Z)
					player.Score.Value = player.Score.Value + math.abs(toCurrent.Z)
					lastPosition = currentPosition
					
					-- Get current tile
					local ray = Ray.new(character.HumanoidRootPart.Position, Vector3.new(0,-100,0))
					local part, position, normal = game.Workspace:FindPartOnRay(ray, character)	
					if part and part:IsDescendantOf(trackModel) then
						local tile = part.Parent
						while tile.Parent ~= trackModel do
							tile = tile.Parent
						end
						
						-- Check if current tile has been initialized
						if not currentTile then
							lastTile = tile
						end
						
						-- Check if the player is on a new tile. If so then update the track
						currentTile = tile						
						if currentTile ~= lastTile then
							tutorialTilesDone = tutorialTilesDone + 1
							if (not tutorialFinished) and tutorialTilesDone > #Configurations.TutorialLayout then
								tutorialFinished = true	
							end
							if not tutorialFinished then
								updateTutorial(player, tutorialTilesDone)
							end							
							local turned = (currentTile.Name ~= "Straight" and currentTile.Name ~= "Obstacle")
							if (not tutorialFinished) and tutorialTilesDone <= #Configurations.TutorialLayout then turned = false end
							trackManager:UpdatePosition(currentTile, turned)
							lastTile = currentTile
						end
					end
				end
			end
			wait()
		end	
		
		game.ReplicatedStorage.Events.EnableControls:FireClient(player, false)
		-- Run is over, update best score
		local best = player.leaderstats["Best Score"].Value
		if score.Value > best then
			local diff = score.Value - best
			pcall(function() PointsService:AwardPoints(player.userId, diff) end)
			player.leaderstats["Best Score"].Value = score.Value
		end
		score.Value = 0
		
		wait(5)
		
		player:LoadCharacter()
	end)

	game.ServerStorage.Events.Pickup.Event:connect(function(pickuper)
		if player == pickuper then
			score.Value = score.Value + Configurations.PointsPerPickup
		end
	end)
	
	manager.Cleanup = function()
		running = false
		if trackManager then trackManager:Clear() end
		if game.Workspace.PlayerTracks:FindFirstChild(player.Name) then
			game.Workspace.PlayerTracks[player.Name]:Destroy()
		end
	end	
	
	return manager
end

return PlayerManager

2nd Possible Source Of Error:

(ServerScriptService - Script):

-- Process Tiles
local ZoneParser = require(script.ZoneParser)
local PlayerManager = require(script.PlayerManager)

ZoneParser:ParseType("Straight")
ZoneParser:ParseType("Left")
ZoneParser:ParseType("Right")
ZoneParser:ParseType("TJunction")
ZoneParser:ParseType("Obstacle")
ZoneParser:ParseType("Obstacle2")

ZoneParser:ParseType("Tutorial")

game.Workspace.DisplayElements:Destroy()

local trackSlots = {}
for i = 1, 6 do
	trackSlots[i] = {player = nil, height = 50 * i}
end

local managers = {}

game.ReplicatedStorage.Events.StartRunning.OnServerEvent:connect(function(player)
	
	local playerSlot = player:WaitForChild("slotHeight")
	local manager = PlayerManager:Run(player, playerSlot.Value)
	managers[player.Name] = manager
	
	wait()
	
	player:LoadCharacter()
end)

game.Players.PlayerAdded:connect(function(player)
	local playerSlot = nil
	for i = 1, 6 do
		local slot = trackSlots[i]
		if not slot.player then
			slot.player = player
			playerSlot = slot
			break
		end
	end
	local slotHeight = Instance.new("IntValue", player)
	slotHeight.Name = "slotHeight"
	slotHeight.Value = playerSlot.height
end)

game.Players.PlayerRemoving:connect(function(player)
	if managers[player.Name] then
		managers[player.Name].Cleanup()
		managers[player.Name] = nil
	end
end)

Here's the WIP of the game: https://www.roblox.com/games/1543745525/Undertale-Temple-Run-WIP

Uhh... Well this is awkward....

Just get the template back up... It's not hard...

You can grab the music and everything except the scripts and move it over...

It's not that difficult even... (What's the point of this question?)