Ever since I took a logic design course, I've been interested in a puzzling logic gate game. The interface is a little clunky and difficult to use. I'd have to move my mouse off the gate and back on before clicking again to switch the gates. Also not sure if there were more than two puzzles and it was crashing on the second finishing or if that was it.
If you keep working on the game, I would suggest tutorializing the different elements for those who haven't studied logic gates. I'd also suggest making switching gates more deliberate (for example, you click on the gate you want on the left side, then click the gate to change or vice versa).
Another idea would be to provide starting points (high/low current) and give the player access to only a few gates. Then the puzzle is building the circuit instead of just switching the gate in the circuit.