A lot of the game is really left up to interpretation and the story isn’t necessarily linear, but there are a few wikis and a TV tropes page out there compiled by fans if you want more info.
Thank you for the hint :) It's a shame, that nobody did a video analysis on both the ''No Delivery'' and ''Sorry, We're Open'', though. Not that I'm too lazy to analyze them myself, It's just that both of the games are deep enough too dive deep into the explanation of their overall story and meaning.
In my opinion, both the ''No Delivery'' and ''Sorry, We're Open'' are a perfect example of games which depict the mix of living an everyday working life and being stuck in a limbo/hell of sorts. For some reason, I find this type of horror games especially fascinating, and your games, I think, set an example of doing ''mundane job, but in hell'' type of plot right.