I have another bigger and better mod: https://mcreator.net/modification/82889/jolium-mod
This mod adds levels 0-11, 13, and 3999. It takes a new perspective on backrooms mods focusing on building and exploration rather than survival. There are many new craftable building blocks in the mod however the portal can't currently be accessed in survival.
You can teleport to and from the backrooms using the no-clipper.
I generally accept suggestions for enigmatic levels, sub-levels, but not joke levels. Also right now I'm taking a pause on development to work on my other mod so suggestions will take longer and may not be worked on.