Stunning visuals, great sound design, good writing... but... Now I'm a game designer first and for most so that's the first things I look at, so:
- Highlighting: As much as there is already a cursor sprite change for objects you can click on, it would be cool to have an actuall highlight either for things you didn't click or are hovering over. Now this isn't a major issue for the calm part but I actually ended up just tapping my LMB near the end cause it's just really hard to see anything with all of the shaders and with everything being pretty much the same visually. The cursor also seams to change only sometimes for those parts.
- Checkpoints/Skipping: The whole game has a bunch of unskipable transitions so it would be good if the game either wouldn't send you back to the start or allowed you to at least skip the tranitions as they get in the way when trying the puzzles again.
Not much else to say, as there is not much gameplay to pick appart in a text based game.