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.

[1] https://lainchan.org/%CE%A9/res/17698.html

[2] https://3dchan.net/dungeon/

[3] https://github.com/AlexKrunch/AnonIB-3D