An Atari game during 1983? Right when E.T. is released in that year, what would follow the crash of '83. I digress but I have to say, though, it ain't bad.
Although how graphics look like, I may say there are some missing parts that make up as an Atari video game, like simpler graphics (Which ain't bad but it could be simpler and chunkier in my opinion), crunchy sound waves (You did well, but noise seems to have this tone that I don't think it goes well with it. Just make it crunchy) and how every character moves.
It's that it moves in linear path, heck I don't think Atari might have no problems having characters to move smoothly, but I have my bias with that kind of statement regarding how characters move in console games, especially like Atari.
Overall, not bad! I give this about three stars! Could improve on some areas but it does do a good job on how hypothetically could Doom be as an Atari game back in 1983.