Bummer the platinum might be super tough. But like how are the puzzles are they just dumb ridiculous or are they fairly decent with some thought?
Little tough to describe, but here goes:
(1) Your routine runs will have a handful of puzzle rooms that feature one of either a logic (Parlor) or math (Dartboard) puzzle. No hints are given, just some ground rules, then they just let you go. Otherwise it's entirely about deploying a design strategy as you open new rooms, choosing which to prioritize at the start, how many areas to populate, whether you should continue your present run or sabotage it by migrating resources to the next one, etc.
(2) As you navigate the mansion, you'll start picking up hints and clues within the environment (via items, journals, room assets, etc.) that will lead you down a rabbit hole to discover things aren't as they seem. There is a secondary plot behind the primary mission, but - to avoid spoilerts - I'll leave it at that. It's evocative of a game like The Witness and The Talos Principle, IMO.
(3) There is a community forming to work through some deeply complex game theorization, but this is going way overboard for most people. The bulk of players (myself included) are better off just reviewing fans' treatises after the true hardcores among us write them
The loop is ostensibly luck-driven and as you discover new room types, floorplans, etc., their additions to your catalog dilute your ability to acquire the room you need in the moment you need it, thus the game gets progressively more difficult as you progress. I managed to finish the game's main objective (locate Room 46) just this evening and I laud it with same level of praise, it's an exceptional experience. It's not a game for the mass market, it's a game for specific player type, but what you find beneath its surface is infatuating.
EDIT:
If I were to put a difficulty tier on the platinum, it's going to be 9/10 due to the time investment, the puzzles' necessitating your active attention, and RNGesus smiling upon you. Not looking forward to having to unlock Dare and Curse Modes, then beat the game with them enabled, then beat the game on the very first day O...O