I watched a playthrough of Iru! for the PS1 and it's kinda neat.
Lovecraft inspired walking sim with Twilight Syndrome vibes.
The reverence it has for Lovecraft's works makes it almost "canonical" in the sense that it's not 'loosely inspired' by the works like so many modern media, but takes efforts to be extremely accurate to the source material to a level I've not often seen, despite being set in a totally atypical location (Japanese school).