Interestingly complex game. Visuals are really nice too. The one thing I though was a bit annoying was that I couldn't automatically go to next level upon completion of a level. Also, several instances it felt like there should have been redundant controls for left/right buttons and button clicking with mouse. I didn't figure out if there was a way to remove a connection without removing the unit (e.g. the plus-brick). And for future polish it one could see the connecting of the wires between the parts while making the connections it would be really cool.
In summary, nice game.