As someone that is on the verge of blowing up my house by tinkering with electronics I really liked the concept, it was nice to relax and complete a circuit knowing I wont fry anything.
And thats what I think the game could benefit from having. A simple adition I would recommend is having 1 or 2 extra paths going that the player will need to pass the circuit from a resistor so it doesn't burn out the light (in this scenario an LED not a light bulb).
Really nice and relaxing game, good job!