Played this game with the family as a Halloween treat to make up for the fact that we couldn't go trick-or-treating, and we all really enjoyed it (despite the slightly spooky-sounding title, the game is really no more scary than a Scooby Doo episode, and uses similar tropes surrounding circuses).
It was good value, fun, purely online, not too long or difficult, and used a variety of different digital sleuthing techniques.
However, what really elevates this from merely a "good" game to an "outstanding" game is the conversational interaction you have with an in-game character. I don't know exactly what tech Society of Curiosities use to facilitate this - whether it's a mixture of automated chatbot and real, manually-entered human responses - but it's seamless, responsive, and completely natural. The character serves as your in-game guide, narrator, hint system but also provides memorable, laugh-out-loud funny responses. For UK players, this was handled through a WhatsApp-style web interface (which also simulated voice-calling), and it worked completely flawlessly and totally made the game for us.