I was more impressed by how accurate he got the animation and movement of Mario compared to the N64 than the fact he's on a different game engine.
But... This guy claimed to have started the Mario 64 remake Feb 2014, got people to give him money through patreon and the only actual progress he's seemed to make is smoothing out Mario's animations/movement, made him prettier and put him into unreal engine 4. He might have more to show on his twitch but it doesn't seem to have any past broadcasts so I can't see anything.
Kinda, I found this http://imgur.com/a/SuFCp