Great game! Over a few sessions I played this to the finish and had fun with it. You did a nice job introducing the different enemy styles and abilities so that it never felt overwhelming and you were able to layer them in later puzzles. You did a nice job infusing a puzzle game with the personality of your characters, too -- I thought that was great. And I saw your note about using the passwords instead of continuing, so that wasn't a problem. I think on the first puzzle with the 90-degree view enemies you marked the floor to give a sense of it, but I was still unsure for a while about how that worked, and how the view wrapped around obstacles -- as another commenter noted, a visualization like flashing tiles on the first introduction could be helpful, though I worked it out eventually.
This game is another interesting one because I don't think these types of puzzle games were popular on the NES, or perhaps even existed at all (I don't recall any, perhaps an NES historian here will!), and yet there's no hardware reason why they couldn't have been (as might have been the case with a first person shooter or open world game). And so with this jam, we get one! Nice!