Like, you can't search somehow for games about "Fishing" or "Cooking" or "Solving a Murder"?
You can. There are families Food / Cooking and Sports: Fishing / Angling. (They are under browse on the top of the page). Well, for "solving a murder" you should check the category Murder/Mystery. Yes it's strange and confusing that instead of a well-structured "theme" data, they are scattered among other things.