This my friend is Rabano (since there is no credit given here)'s amazing work in progress. Yes, it's a public release, but not an official release. Rabano uploaded it because of a computer scare that his computer were acting up. Luckily for him that he did, since the computer died a very short time after, so he could resume work on this and not let it die with a new computer.
He is mostly done, and it is more or less shading in sprites that is left.
I watch this closely on YouTube for example, and love Rabano's work in general. Great to see it here to give it more attention.
https://www.youtube.com/@RabanoMugen/videos