Main thing really missing is sound.
I very much enjoyed playing, though I got stuck on the traffic light level. I assume I needed to swap the color of the lights, but that didn't do anything when I tried.
I probably missed something obvious, but my opinion on puzzle games for game jams is that you should always add a skip level button, so people can experience your whole game even if they can't solve one puzzle.
Anyway the gameplay and swap mechanic were really smooth and I very much enjoyed the levels I did manage to solve. Well done game pls add some free sound effects!