I release and develop based on what Patrons want, and right now my focus has been other games. The mainstream game path over 350 pounds hasn't been implemented yet as a result. I do have plans to add content through that, fix some voice acting, and have an idea for a sequel, so that will happen if it's voted on.
Iris does get well over 350lbs in the ending and way past that in the bad ending regardless, so there's over 350lbs of Iris in the main game already - just not on the main story path.