@MichaelKlamerus @Bogusmeatfactory Not the first, but very early, and using the same raycasting techniques that drove the rise of FPS games in the 90s — except with a fascinating story to unravel, a very low framerate, and a sadistic design that'll kill you for anything.

There's a great tale behind its creation, too, which is laid out on the GitHub project page as well as in my Secret History of Mac Gaming book.