About
Doom is id Software's 1993 first-person shooter for MS-DOS and the first game in the Doom franchise. Phoenix DOOM is a backport and remaster of the 3DO version of DOOM for Windows, macOS and Linux. It is derived from Rebecca Ann Heineman's 3DO DOOM source code release. It aims to make the 3DO version playable on modern operating systems, with enhancements, bug fixes and quality-of-life improvements, while keeping the original's essence.
How it differs from the original
It runs natively on modern desktop systems instead of the 3DO and adds enhancements, bug fixes and quality-of-life improvements. A document in the repo lists its differences from 3DO DOOM.
Getting started
The repository includes a guide to playing and configuring the game, a list of known issues, and build instructions.