Not trying to flame the guy since he obviously put in a lot of work on his own, but the original idea is from a lainchan thread [1] for the 3d anonymous imageboard 3dchan [2]. I'm only assuming they're not the same person since this project is not on the 3dchan owner's github [3]. Again, the two are quite clearly different, and parallel creativity does exist in the realm of possibility, but my personal guess is he used the same concept to build something similar.
There's no "original idea" here. It's an obvious idea I presumed most people have had. At least I have and I haven't seen any of these before so I don't see why he couldn't have made this independently of 3dchan.
[1] https://lainchan.org/%CE%A9/res/17698.html
[2] https://3dchan.net/dungeon/
[3] https://github.com/AlexKrunch/AnonIB-3D