Super cool! Again really enjoyed the levels and it was obvious that you learned from The Stack Machine and added more visualizations of the process the machine was moving through and you could really see what it was doing at each step.
Another game where the a feature (states) were only really useful in the last level so I'd love to see more levels! Maybe even levels where there are two or more inputs so you need to make the rules generic to be able to handle many of them instead of just building them to a single set of inputs.
Really like the ideas explored here though!