This game is about solving puzzles by collecting and contextualizing visual clues and answering riddles. Both of this mechanical elements works well together: player is taught to notice both visual and textual clues and combine them in a proper way to get the answer. Sometimes text's meaning contains all the required information ("Math" and "Aibophobia" levels), sometimes only a visual clue (color) can give this meaning new direction ("Name Calling" level). This way the gameplay combines very well with the detective story against which it is set. Although operating only in the textual medium, player is forced to take notice on something unusual in the text itself, i.e., its visual properties, that serve as clues (not unlike a detective that looks for inconveniences in a convenient scene). This way the intensity and thrill of a detective story is masterfully achieved with what seems to be an absolute bare minimum means of procedural expressiveness, and are further enhanced with the story, the music and with the text animation and coloring (white against black background).
P.S.: I've played this game after I tried playing "A Sweet Typing Thrill" and got stuck on the "abjurer" level. Probably, the second game has put me in an appropriate mindset, and the puzzles here did not seem as difficult to me. Although the challenges in this game are objectively easier than in the second one, their subjective difficulty for me is larger due to the fact that English is not my native language. With every word-based puzzle I had to ask myself: "Do I even know the word that is hidden here?".