I've only played about an hour, much of which I spent sloppily fumbling about. But yeah, it's really impressive.
I haven't played Bloodborne yet, so I can't compare it directly, but even on its own this seems like a great game... and it looks and feels so wonderfully atmospheric.
I know it goes against the spirit of it, but I think I might love it if someone modded modern controls into it. I have no experience or nostalgia for that control system, so to me it just feels deliberately janky. I say "think" because some of the level design and all of the camera handling (the way scenes are framed, presented) seems oriented around the control scheme, so modern controls might be too much of a compromise for its overall aesthetic and feel.
This thing is more polished and professional than many games I've happily paid for. Mighty impressive work for one person.