The concept is great, 5 starts for that! But only 3 stars in the end due to the levels. The amount of actual puzzle here is almost ridiculous :(
There are 5 non-puzzles (just activate the switch(es) and done) and maybe 2 things that are almost a puzzle.
With these logic gates you can go several orders of a magnitude more complex.
I never had to actually resolve any logic in these puzzles, just try some combinations of on and off.
You really could go to logic with many bits so that at least trial and error won't bring you there, binary adders, cryptographic things, almost anything that has more challenge than what was in here!