According to that previously mentioned interview with the designers of the game, this was an oversight on their part. When they were creating the game, they had instant access to any area of the game, so the thought never occurred to them to put in a save or password feature. It wasn’t until after the game was finished

https://www.retrojunk.com/a/A4Hln2R72v/in-defense-of-festers-quest

that they realized their mistake.