This is a brilliantly unsettling game. It uses the form of both online quizzes and Twine in general to tell an engrossing story. It's got intrigue, it's got mystery, it's got unspeakable horror. What more could you want?
I won't spoil anything for you. This game uses the advantages of Twine and its choice-based narrative structure perfectly. The situation is immediately unsettling, and that feeling ramps up as you go, especially once you hit the fourth phase.
Playing the game more than once reveals that your choice do impact the final reveal of who YOU are in significant ways, but at the same time masterfully conveys the futility of it all. No matter who you are, it doesn't matter. You're in the same horrifying place in the end.