Flying script bug

Help and Feedback Scripting Support
1

I wrote a flying script yesterday, everything is okay with it except for the movement.

after I collide with something my character starts to rotate:
https://gyazo.com/e0390410932c17df1b2212f6662076fa

local player = game.Players.LocalPlayer
local Character = script.Parent
local Humanoid = Character:FindFirstChild("Humanoid")

local cam = workspace.CurrentCamera
local UserInputService = game:GetService("UserInputService")

local idleAnim = Character:WaitForChild("Humanoid"):LoadAnimation(script:WaitForChild("FlyIdle"))
local forwardAnim = Character:WaitForChild("Humanoid"):LoadAnimation(script:WaitForChild("FlyForward"))


local w = false
local a = false
local s = false
local d = false

local flying = false
local canFly = false

Humanoid.StateChanged:connect(function(old, new)
	if new == Enum.HumanoidStateType.Freefall then
		canFly = true
	elseif new == Enum.HumanoidStateType.Landed then
		canFly = false
	end
end)

UserInputService.InputBegan:Connect(function(key, chat)
	if chat then return end

	if key.KeyCode == Enum.KeyCode.Space and (canFly or flying) then
		if not Character or not Humanoid or not Character:IsDescendantOf(workspace) or
			Humanoid:GetState() == Enum.HumanoidStateType.Dead then
			return
		end

		if flying then
			Character.Animate.Disabled = false
			idleAnim:Stop()
			forwardAnim:Stop()
			Character.PrimaryPart:FindFirstChild("FlightForce"):Destroy()
		elseif not flying then
			for i,v in ipairs(Humanoid:GetPlayingAnimationTracks()) do
				if tostring(v.Name) == "FallAnim" then
					v:Stop()
				end
			end
			Character.Animate.Disabled = true
			idleAnim:Play()
			print(Humanoid:GetPlayingAnimationTracks())
			Character.HumanoidRootPart.CFrame = CFrame.new(Character.HumanoidRootPart.Position, Character.HumanoidRootPart.Position +  cam.CFrame.LookVector)

			local bv = Instance.new("BodyVelocity", Character.PrimaryPart)
			bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
			bv.Velocity = Vector3.new(0,0,0)
			bv.Name = "FlightForce"
		end
		flying = not flying
	end

	if key.KeyCode == Enum.KeyCode.W then
		w = true
	elseif key.KeyCode == Enum.KeyCode.A then
		a = true
	elseif key.KeyCode == Enum.KeyCode.S then
		s = true
	elseif key.KeyCode == Enum.KeyCode.D then
		d = true
	end
end)

UserInputService.InputEnded:Connect(function(key)	
	if key.KeyCode == Enum.KeyCode.W then
		w = false
	elseif key.KeyCode == Enum.KeyCode.A then
		a = false
	elseif key.KeyCode == Enum.KeyCode.S then
		s = false
	elseif key.KeyCode == Enum.KeyCode.D then
		d = false
	end
end)

while task.wait() do
	if flying then
		Character.PrimaryPart:FindFirstChild("FlightForce").Velocity = Vector3.new(0,0,0)
		forwardAnim:Stop()
				
		if w then
			Character.PrimaryPart:FindFirstChild("FlightForce").Velocity = cam.CFrame.LookVector * 100
			forwardAnim:Play()
			Character.HumanoidRootPart.CFrame = CFrame.new(Character.HumanoidRootPart.Position, Character.HumanoidRootPart.Position +  cam.CFrame.LookVector)
		end
		if a then
			Character.PrimaryPart:FindFirstChild("FlightForce").Velocity = cam.CFrame.RightVector * -100
			forwardAnim:Play()
			Character.HumanoidRootPart.CFrame = CFrame.new(Character.HumanoidRootPart.Position, Character.HumanoidRootPart.Position +  cam.CFrame.LookVector)
		end
		if s then
			Character.PrimaryPart:FindFirstChild("FlightForce").Velocity = cam.CFrame.LookVector * -100
			forwardAnim:Play()
			Character.HumanoidRootPart.CFrame = CFrame.new(Character.HumanoidRootPart.Position, Character.HumanoidRootPart.Position +  cam.CFrame.LookVector)
		end		
		if d then
			Character.PrimaryPart:FindFirstChild("FlightForce").Velocity = cam.CFrame.RightVector * 100
			forwardAnim:Play()
			Character.HumanoidRootPart.CFrame = CFrame.new(Character.HumanoidRootPart.Position, Character.HumanoidRootPart.Position +  cam.CFrame.LookVector)
		end
	end
end

but it came out buggy and randomly moving my character backward
it also won’t rotate the character when the player stops moving.

and the movement is just bad, if you can give me a way to fix it or an idea that I can write, it will be helpful

you can also test it yourself by putting the script in Starter Character Scripts

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