This is, first and foremost, a horror game with fantasy elements. The world is careless towards the troubles of its denizens at best and outright cruel at its worst, and its worst is its most common. While there are NPCs, plots, and overall moments that cut through the gloom as sparks of light, you should enter knowing that this is a Game that may be emotionally taxing if you are not the kind of person who likes near-relentless downers or who may be personally effected by bad things happening to your characters, whether physical, mental, or emotional. This is a game meant to be fun to people who derive enjoyment from putting their OCs through a horrific wringer and who delight in watching their characters suffer.
Which is not to say fun, funny, whimsical, beautiful things do not happen, that beautiful relationships don't blossom, and that close and tender moments between one's character and other characters, NPCs, or the world at large, do not happen, they absolutely do, but they are not the theme and are not constant, breathing room is often little and far between.
To use a TTRPG for example, many multiverse fantasy roleplays are a lot like DND, they're a fun power fantasy romp where the hero will almost always win in the end, where you can overcome any and every obstacle with self belief and friendship, where the Gods are on your side and if they aren't will surely be struck down, most games end with being paraded through the streets showered in gold, orphans find their parents miraculously alive or themselves miraculously adopted, and light always overpowers shadow.
P&P then is more like Trophy Dark, a grim, despairing, 'play to lose' game where the expected end goal is that the player will at best die, and at worst become something terrible and they will suffer and struggle all the way from the beginning, and where most of the light is just the end of an anglerfish's lure, a promise that only really resolves in more pain and devourment.
Further Tone examples:
Dark Souls, Elden Ring, Berserk, When the Wind Blows, Plague Dogs, Watership Down if general Woundwort had Won, Undertale if it were the Genocide run every time forever, Neverending Story but it ends at the Swamp Scene, Shadow of the Colossus, Persona 3, Hollow Knight, Ori & The Blind Forest, Tale of Two Brothers, Dead by Daylight, The Road, Princess Mononoke, Pathologic, Fear & Hunger, Devilman Crybaby, Goodnight Punpun, Nier, Drakengard, Clannad After Story, What Remains of Edith Finch.
In essence, while I absolutely do not want to scare anyone off or make it sound worse than it is, I do want to keep people safe, if you don't find it fun to be cruel to your characters, if you have a hard time separating IC suffering from OOC suffering, you aren't going to enjoy your characters potentially being broken mentally|physically|emotionally, then I would encourage you to err on the side of caution and not join us for your own mental and emotional safety and wellbeing.