I need help with my block placer script that's not working right?

I dont know why but this script keeps putting down a tower instead of one part. Its suppose to loop and make it so I put one part down at a time but instead it puts down a ton of them stacked on each other and then stops.

Code...

	wait(2)
	local player = game.Players.LocalPlayer
	local mouse = player:GetMouse()
	local blankPart = game.Players.LocalPlayer.PlayerGui.BlockGui.Block.Part
	blankPart.Anchored=true
    blankPart.CanCollide=false
	blankPart.Transparency=0.75

	local mouseDown = false
	local connection
	 
	connection = mouse.Move:Connect(function() 
	    if not mouseDown then
	     --wait(0.1)
	        local part = blankPart:Clone() --never change the original part, only a clone
	        part.Parent=workspace
	        mouse.TargetFilter=part --ignore the clone while getting mouse position
	        local moveConn
	        moveConn = mouse.Move:Connect(function()
	            local p = mouse.Hit.p
	            part.Position = Vector3.new(math.floor(p.X),math.ceil(p.Y),math.floor(p.Z)) --mouse position in whole numbers
	        end)
	        mouse.Button1Down:Wait() --do not have to connect a click function :)
	        moveConn:Disconnect() --stop moving the clone
	        part.CanCollide=true
	        part.Transparency=0
	    end
	end)
	 
	mouse.Button1Down:Connect(function()
	    mouseDown = true
	    connection:Disconnect() 
	end)