I doubt it as it's just a remake of 1 1993 Doom level in Unity using none of the originals data or textures. And the original DOOM is open source on git-hub.
Viewing post in Doom [Retro Remake] Level 1 comments
Do ID have "Doom [Retro Remake] Level 1" copyrighted?
Also, it is legal to copy a small portion of something or a larger portion for educational purposes. And this was a test of the Unity game engine and my skills at recreating the first level of DOOM in Unity.
Check out Fair Use https://en.wikipedia.org/wiki/Fair_use