Voices is a strong, story-driven parser game told from the perspective of a mysterious invisible figure, whom we learn more about throughout the game. The narrator is the figure, while the PC is a young girl they speak to.
This is a strong story, and most of the game is designed to funnel you through the story. This would easily make a good Twine game; this is in fact the kind of game Twine was designed for. However, the author has done a great job of changing default messages and adding extra surprises, making it worthwhile to have it in a parser.
Much of the game progresses by repeatedly using "TALK TO", and by making a few decisions.
A great choice for fans of story telling. No puzzles to speak of. I had a lot of fun with this.