Congratulations, thanks a lot for playing and the detailed feedback, I'm happy you enjoyed it.
If you put the Sewer sign somewhere in 1983 then there's an entrance to the sewers in the same spot in 1985, ect.
When you enter the map they determine the shortest map like they wasn't any enemy, then they follow exactly that path only stopping to fight an opponent group when it's adjacent before moving on.
Sorry for the food description, it has more or less chance to work depending on the enemy but it's indeed instant KO. Except for the ones to the teleporter (with a text when adjacent then) finding the hidden walls is optional but maybe there could indeed be a visual hint anyway.