Thanks for playing and your extensive feedback, The snapping back of the pieces is a good idea i will definitely do that in a post version and i guess i can also add wasd , i had that first but that felt very clunky so i should really think about how to implement that in a natural way.
To be honest i did not think the puzzle would be that hard as some pieces like the corners or edges have only so much places and i made the matching very generous (i was afraid it was to easy to be honest) But then again i know the puzzle which of course makes it easier.
Good luck if you come back on the signal game, my advise is try to match the amplitude first and then the frequency.
Also glad you noticed the ghost