Sorry, for the necro (after a week, I guess), but I figured making a new thread would be pointless since this discussion exists. So since the game became free to play as opposed to $9.99 when it was on Steam, I figured "**** it" and decided to play it through. The Universe+ feat seems legit, actually.
The author avatar character (who appears as a 3-D version of what I think is a sprite from one of his other games?) is the one who created and controls everything, repeatedly being referred to as the "puppet master" and "storyteller". He's also never directly referred to as an avatar for Scott Cawthon in the context of the game, but it's pretty damn obvious. After defeating him, he uses his dying words to say you probably could have made a better ending, but instead, you chose to finish the story by killing the storyteller. He then dies, and the universe ends (with the words "THE END" plastered on a black screen). You cannot continue from this point and are forced to exit the game, before booting it back up to continue again, since otherwise there would be no world to continue from. So the meta Universe+ feat isn't from something like "they beat the author avatar, so they must be universe level+". It's because it's an actual Universe level+ feat. There's also a magical foul-mouthed rainbow who dwarfs the author avatar character in power.
I wish I was joking.
As for the non-canon issue, yeah, it's not in the same continuity as the main games (which is pretty obvious unless you're actually braindead), but it's not entirely "non-canon", per say. I couldn't find any direct references to it being so, and it appears to be part of a self-contained alternate reality. While different, it's still a work of the original creator, but were any profiles to be made, they'd need to be noted to be from "FNaF World" specifically (obviously).
In short, I don't really see a problem with profiles being made here, should someone want to do so. It's not like it's so meta that it can't have actual feats, and if the non-canon thing is such a big deal, we'd have to get rid of DB:GT, Archie Sonic, and many more entire verses which are arguably significantly less canon than this. However, I'm not sure how to tier many of the characters who aren't important enemies like the author avatar, as scaling them all to Low 2-C seems absurd.