The game-world is well thought-out, fleshed out, and told in such a graphic way that the illustrations are almost redundant. I loved the technique of having the character recall past events by player reliving them; reminiscent of Spider and Web but put in quite a different context. This also makes mercifulness only natural.
Retrospective episodes are sometimes quite distant in time, but weaved skillfully (with brilliant use of a trinket) into a cohesive story, developing the protagonist (and another character) in much detail. Puzzles also feel natural, not really puzzles at all, just something you do; only at one point I had no idea what to do next (and it turned out to be quite obvious, had I thought as the character would at that point, and not as a player sifting game text for clues does).