Why am I not able to move my character on mobile with this script?

game.Players.LocalPlayer.Character:findFirstChild("Torso") 
game.Players.LocalPlayer.Character:findFirstChild("Humanoid") 
local mouse = game.Players.LocalPlayer:GetMouse() 
repeat wait() until mouse
local plr = game.Players.LocalPlayer
local torso = plr.Character.Torso  
local root = plr.Character:WaitForChild("HumanoidRootPart") 
local flying = false 
local ctrl = {f = 0, b = 0, l = 0, r = 0} 
local lastctrl = {f = 0, b = 0, l = 0, r = 0}  
local speed = 60
local human = game.Workspace[plr.Name].Humanoid

local bg = Instance.new("BodyGyro")
bg.P = 9e4
bg.maxTorque = Vector3.new(9e9, 9e9, 9e9) 
bg.cframe = torso.CFrame 
	game.Players.LocalPlayer.Character.HumanoidRootPart.DescendantAdded:connect(function(dec)
		if dec.ClassName == "BodyGyro" and flying then
			wait()
			dec.Parent = game.Players.LocalPlayer
			repeat wait() until not flying
			if dec.Parent ~= nil then
				dec.Parent = game.Players.LocalPlayer.Character.HumanoidRootPart
			end
		end
	end)

function Fly()
	local dec = game.Players.LocalPlayer.Character.HumanoidRootPart:FindFirstChild("BG")
	if dec then 
		dec.Parent = game.Players.LocalPlayer
		coroutine.resume(coroutine.create(function()
			repeat wait() until not flying
			if dec.Parent ~= nil then
				dec.Parent = game.Players.LocalPlayer.Character.HumanoidRootPart
			end
		end))
	    end
	bg.Parent = torso
	local bv = Instance.new("BodyVelocity", torso) 
	bv.velocity = Vector3.new(0,0,0) 
	bv.maxForce = Vector3.new(9e9, 9e9, 9e9) 
		repeat wait() 
		plr.Character.Humanoid.PlatformStand = true 
			if (ctrl.l + ctrl.r) ~= 0 or (ctrl.f + ctrl.b) ~= 0 then 
				bv.velocity = ((game.Workspace.CurrentCamera.CoordinateFrame.lookVector * (ctrl.f+ctrl.b)) + ((game.Workspace.CurrentCamera.CoordinateFrame * CFrame.new(ctrl.l+ctrl.r,(ctrl.f+ctrl.b)*0,0).p) - game.Workspace.CurrentCamera.CoordinateFrame.p))*60
				lastctrl = {f = ctrl.f, b = ctrl.b, l = ctrl.l, r = ctrl.r} 
			elseif (ctrl.l + ctrl.r) == 0 and (ctrl.f + ctrl.b) == 0 and speed ~= 0 then 
				bv.velocity = ((game.Workspace.CurrentCamera.CoordinateFrame.lookVector * (lastctrl.f+lastctrl.b)) + ((game.Workspace.CurrentCamera.CoordinateFrame * CFrame.new(lastctrl.l+lastctrl.r,(lastctrl.f+lastctrl.b)*0,0).p) - game.Workspace.CurrentCamera.CoordinateFrame.p))*0 
			else 
				bv.velocity = Vector3.new(0,0,0) 
			end 
		bg.cframe = game.Workspace.CurrentCamera.CoordinateFrame 
		until not flying 
			ctrl = {f = 0, b = 0, l = 0, r = 0} 
			lastctrl = {f = 0, b = 0, l = 0, r = 0} 
			speed = 0 
			bg.Parent = nil
			bv:Destroy() 
			plr.Character.Humanoid.PlatformStand = false 
		end

script.Parent.MouseButton1Down:connect(function()
print("Noclipping")
if (flying == false) then
print("Starting to noclip")
flying = true
Fly()
elseif (flying == true) then
print("Stopping noclipping")
flying = false
end
end) 
	
mouse.KeyDown:connect(function(key) 
	if key:lower() == "w" or human.MoveDirection.Y > 0 then 
		ctrl.f = 1 
	elseif key:lower() == "s" or human.MoveDirection.Y < 0 then 
		ctrl.b = -1 
	elseif key:lower() == "a" or human.MoveDirection.X > 0 then 
		ctrl.l = -1 
	elseif key:lower() == "d" or human.MoveDirection.X < 0 then 
		ctrl.r = 1 
	end 
end) 
	
mouse.KeyUp:connect(function(key) 
	if key:lower() == "w" or human.MoveDirection.Y > 0 then 
		ctrl.f = 0 
	elseif key:lower() == "s" or human.MoveDirection.Y < 0 then 
		ctrl.b = 0 
	elseif key:lower() == "a" or human.MoveDirection.X > 0 then 
		ctrl.l = 0 
	elseif key:lower() == "d" or human.MoveDirection.X < 0 then 
		ctrl.r = 0 
	end 
end)
Fly()

You need UserInputService in your life my child, also when using UserInputService remember if you're making a custom walkscript you'd need to add keycode and Touchcontrol, theres a thing on the wiki about the mobile controls.