Really interesting concept. I spent way more time playing it than initially expected. I think it has a great potential. The controls could be improved. It doesn’t seem possible to cancel the “order” (once I chose a device, I have to place it somewhere, even if it was a mistake). Also moving existing devices would make it more appealing.
As for the gameplay, accumulating points forever starts feeling… pointless :D I thought that maybe going with the factory metaphor, player could get different orders to fulfill. Each level could start with a special collector that only accepts a certain numbers (say 7, or 250) and your goal would be to build a factory to feed it this number. You could add devices like subtractors or dividers. Just a thought :-)