Perhaps with less focus on its greatness as a game, but easily one of the most impressive technical achievements in videogame history. It's considered one of the greatest graphical games of this generation so far-- a veritable demo for a slew of the latest technologies on Unreal Engine 4 including usage of the DX12 API, FSR 2.0 & DLSS 2.0 support, ray-tracing (global illumination, caustics, shadows, screen space reflections, ambient occlusion), particle lighting & chromatic aberration adjustment, and even NVIDIA reflex.
It's mind-boggling that just one guy built nearly the entire game by himself.