Well this was just adorable. The electronics theme is neat, the writing is very good, and the transistor/resistor icons having the number it adds/removes is a great little detail that marks a lot of thought was put into it. The drag-and-drop controls make a lot of sense and work well. The graphics aren't incredible, but they get the job done -- that's probably the weakest aspect of this game.
Being a puzzle game the UI and the gameplay are (arguably) most important and I think you nailed those. New mechanics are introduced at a nice pace, and the difficulty ramp is a little on the slow side but it's not bad at all. I absolutely would love to see more levels, and more about poor Meter!
As a side note, on Linux, the component's icons don't appear when they're in the sidebar, but they appear as soon as you click and start to drag.