This isn't an edit I want to make out of the blue, but I noticed that the "Original Game" page pretty assertively describes the original game as "likely the Dark World counterpart of Asriel's video game concepts".
This is a solid theory with some evidence to back it up (including the implied connection between the Green Room and Kris & Asriel's room), but I don't think it's guaranteed enough to cite in the wiki so definitively. I've seen other theories floating around as well — that it's related to Dragon Blazers, that it's purely a creation of the Dark World, that it's a manifestation of Kris's psyche, or some combination thereof. Even if the "MANTLE" game is related to Asriel's game designs, the supernatural aspects of the game make it unlikely that's the full story. In my opinion, the wiki shouldn't favour one theory over others until the game gives us more explicit information (for example, Dess's page makes very few assumptions about her, even though the fandom has a lot of strongly-held theories).
My suggestion is to move this line down to a "Trivia" section or similar, so it's more clear that it's not 100% confirmed yet. Does anyone else have an opinion on this, or a better idea?