I'm having a wonderful time with this game so far! Methodically wandering the dungeon does my EO/SMT-starved heart some good. The visual design in this game is top-notch, too. Would you ever consider some kind of art/design book in the future?
But I also must ask: I've been wandering endlessly yet I can't seem to figure out where to try out the key Velvet gave me. Would anyone have a nudge where to go? Hopefully it isn't one of the sigil I opened with Lilim's keys, as I'd already opened all those and there's nothing left to interact with.