From another article:
""We don't really have a plan in terms of, oh we're going to make more spin-offs or this is going to be a one-off time one-time thing," Ishizaki told IGN. "This was purely sort of happenstance of me wanting to direct my own game and wanting to use Elden Ring and that battle design that I took part in as a base to this game, and my interest in online co-op games as well."

I think it's his first go at directing a game, but he's worked on Bloodborne, DS and DS3, and Elden Ring previously. I don't see this game having a long lifetime like Elden Ring, but it could still be interesting.