I've just downloaded ePSXe to try King's Field 1 because I also have never tried it. I watched some videos and I really love the atmosphere in these kind of games.I would as well tbh. I haven't played the first four but I've heard they're kind of first person proto-metroidvanias and that's my favorite niche sub-genre.
Btw I don't understand why those kinds of open-level back and forth games went out of style. Where's the modern arx fatalis or king's field?