It took me a while to learn the rules, but once I did I really like that it turns into a 'Spot the difference' game as well as a 'solve the puzzle' game - especially when there was no difference!
I'd like to have a larger 'minimum' step count to make the puzzles a little more difficult once I spotted what was different between the two - usually it was only one or two arrows and that made it fairly simple to get the right start point.
Overall cool idea!