Dungeon Stalker for Atari 7800 by Atarius Maximus started out as an homage to Intellivision’s Night Stalker and ultimately evolved into something own. Right now this game should still be considered a work in progress, however it is very a complete and playable game as it is.
I posted 1.190 on 6/11/15, it contains many new features and lots of bug fixes. I also removed the original instruction manual text, put the latest manual behind a spoiler tag, and also added it as a pdf attachment. I highly recommend reviewing the manual as it describes key elements of the game that are important if you want to truly enjoy playing it.