I've actually managed to solve every single level except Chromatic Monolith on this list at least once, and I have solved all of them except 9-E and Chromatic Monolith on my current save (I did something very dumb with the one where I solved 9-E, so I had to make a new one)
I'm at 6 puzzles before fully completing now, and my currently incomplete levels are (base64) OS1FLCBDaHJvbWF0aWMgTW9ub2xpdGgsIE9tZWdhLTUsIE9tZWdhLTE0LCBPbWVnYS0xNiwgT21lZ2EtT21lZ2E=.