This is such an amazing game, Great concept, so much polish for 48 hours. Very excited to see what fixes you add after the jam period.
Perhaps change the path of the linking wires so they don't sit right on top of eachother, this would make it a lot easier for the user to read their design and troubleshoot.
And it would be really cool to have more allowable combinations. its really fun when you think you'll make one letter, but a different one comes out, its like "oh of course, neat!, I'll remember that for future puzzles". But having a question mark come out feels frustrating especially just for mirrors and rotations.
Again, what you've achieved in 48 hours is brilliant, hopefully with a few tweaks and more time you can make the game absolutely perfect.