The main exploration path will actually happen through staircases that physically connect each floor. There’s also a central elevator you unlock during gameplay, which works as a fast-travel system (the green box in the video).
The 3D map is mostly an aesthetic choice, not just for convenience.

Those requirements are:
🔺 An Elevator connects all floors through a vertical hub
🔹 Each floor has a main corridor with key rooms
🌿 Side branches hide extra rooms
🌀 Stairs link adjacent floors between two rooms, offering early access paths between floors

Not yet, I'm still working on an algorithm that suits my needs. The stairs generation will be part of it 👍