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I don't think OiaLT mc made the game due to the fact that it was referenced to be in development during the events of the game, I also don't thing the MC of eternum made it either due to the fact that he has childhood friend who would most likely know of it or there would atleast be some proof. Personally with the way the creator looks, I suspect the creator might be a decendent of Magnus he has eternal life so maybe before he became the walking corpse we all know and love he bore a child with a concubine (you know how rich people are, especially for his time) I think the kid grew up and went on his own little adventure to find out more about his father, although I'm also half suspecting the developer to be a follower of our beloved protagonist or atleast one of the 5 princes. You know how obsessed he was with eternal life so what if he was also interested in alternate worlds and thus ordered the development of eternum. Astoroth probably has quite a few connections see as how he supposedly has lived for a long time. It kinda reminds a bit of comic called eternal club. To keep it short the MC is bestowed the power to control time. He can manipulate it aswell as store and give years of life time to himself or others. In the comic his organisation eternal club is working on creating miniature worlds with ecosystems and life of its own by using his control of time to speed up the process of development on said "small world". It makes me think about what astoroth may have done to learn of eternal life and what kind of experiments he did to create or simulate eternal life. So yea personally I think the creation of eternum is connected to astoroth. Plus with MC in OiaLT leaving the book in a random edge it makes on think of the power in the universe. Makes me excited for 0.5 after that ending in eternum. I hope I'm right about this to be honest.

Makes you wonder if eternum (the in world game) is run by someone or something that is either related to the grimoir of Magnus or atleast has powers similar. I noticed alot of what felt to me like hints about the game being more than just a game, take Calypso for example. A supposed AI that can travel between servers. I think eternum acts as a gateway to other worlds, along with worlds created by people to keep up the facade of "it's just a game" that's why the protagonist of eternum has so many nightmares and memories of things that he doesn't know about yet it is connected to eternum a game he never played until the events of this story. And in once in a lifetime we get hints of other demons existing. Such as the demon in the MCs dream with the doors. It wouldn't surprise me if infact somehow the two MCs are connected. Soon I'm gonna play through both games and get all endings possible to put together a proper theory. Also I think the MC of eternum has his "powers" in the real world aswell seeing as how he has almost super human reflexes. (Note the scene when the bully kicks a soccer ball at his head) I think that he is like the OiaLT protag and has some connection to a demon. 

Also, magic and demons are canonical in this game, look back at 'Once in a Life Time's they outright mention that eternum is a game using a neural device and that game was coming out after the events of 'Once in a Life Time' I can't explain properly. If you want to know more I recommend playing OiLT it's on equal standing as eternum in my book.

I don't usually theories about games but I have a theory about this game. First at the beginning when the protagonist answers the pay phone and the person mention Calypso I think that mightve been idrea, I think that's her name. The ai woman. I'm a bit tired while writing this comment so I apologize if I got the name wrong. Thanks for listening and please let me know who you think it might've been. And if I should go into depth of why I think it was her let me know.