Wut? Thought it's established from current evidence that
Eternum isn't a videogame to begin with ((Andromeda Tapes revealing that the creators of Alien had an out-of-body experience that led them to Eternum - specifically the Andromeda "server" - where they then encountered Xenomorphs, the mysterious dude at the Ulysses party mocking Orion for thinking Eternum was a "videogame," Axel saying that Eternum isn't a "game" due to the tech required to run it being non-existent based on his investigation, William revealing that the Founder discovered Eternum and created the implant so that normies are able to project themselves there without having to rely on the typical methods to induce an out-of-body experience (dreaming, meditation, hallucinogenic substances, having a near-death experience) while also masking the entire process as if they're logging into a VRMMO, that entire thing about Immortals being able to jump in and out of Eternum even with their physical bodies hence Caly thinking that Orion was one)),
but rather a sort of astral realm where dreamers wander and where the spirits of the dead could be seen, as per current definitions...
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The idea also has ties to Greek Mythology, where it is believed that the dream world could be found in the underworld.
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And given Cari's knack for referencing Greek Myths throughout the game (i.e. Orion's character mirroring elements of his mythological counterpart, the whole Greek Myth naming scheme throughout the game like Ulysses and Thanatos and Penelope), it wouldn't surprise me if this is him drawing inspiration from the matter.
IIRC 0.1 the mysterious caller at the telephone booth described them as "gates," but was then changed at some point to just "doors" (along with the added mention of "breaking the chains," which heavily implies that the caller could be Idriel or one of the Syndicate). The idea kinda stuck tho, hence why I'm referring to them as "gates."