Here's a playthrough of my runs. Overall, this is great! I was slightly frustrated that some runs were un-completable. Maybe there were hints that I missed, but I think a little more signposting (like the portal that says "NEAR!") would be great to make me feel like I can understand the layout and common button areas.
I also love the creepy vibe. This is one of those designs that doesn't need lots of story to give clear indication that there's something suspicious about this world.