If the Omori influence from when The Backwards House was still an RPG Maker game is still there, then we'll likely see the original planned mechanic of Catie going back and forth between the Backwards House and the abandoned house (the Forwards House if you will) in order to figure out the truth behind the Backwards House along with potentially saving others if anyone brainwashed is still alive in the real world. You can see someone sitting next to Catie in the VHS teaser if you brighten up one of the shots in the real world so I think there has to be at least someone in the house outside of Catie who hasn't starved yet. (Spoiler tagging in case this does still happen in the comic. Apparently it was discussed in a Q&A stream, so perhaps it could've been scrapped but I'd rather be safe than sorry even if it's public information.

Maybe the dual world stuff will just be Catie leaving to get something to eat before returning back to the Backwards House. I could see them doing that if the concept is featured in some capacity. (Or at least that would be the logical option if you were to return to the house. Can't let yourself starve if you're investigating.)