I'm not sure where you got the idea, that the game tells you what your gender is? The game explores a set of terms and identities and poses a set of questions that can help people explore their own identity. It doesnt "tell you what gender your are".
Exploration of any sort begins with questions, and is facilitated by the information and language we learn or develop along the way to both describe our findings and understand them better. This game offers questions to get us thinking about our personal understanding of our own identities, and provides that language and information to help us through that exploration (in a cool maze room format!)
it informs people one the different forms of identity and expression they can take, it provides labels to those seeking them out. for someone like me, who had been questioning their gender identity for a very long time, it's like having a light shone on a different aspect of myself in each room, and through that I put together a gender that suits me, and can tell others a little more about me in a way that isn't awkward and stilted.