It looks like my next project will be a remake/expanded version of this game in a new engine. Our Denial will be one of the episodes within this new game and will mostly be the same, with maybe an addition of a new zone and ending.
The other episodes will share having multiple endings and subtle choices that put you on a path to those endings, along with the puzzles. They will be their own stories and may not even take place in the same world as one another.
Each episode will be about the length of Our Denial, so the first time will take a few hours and once you beat them, you could speed run it pretty fast.
All this is still a long ways off as I just started documentation for it, but I do have most of the engine done, shy of an enemy spawning system.