Maddy Thorson has put together a truly interesting blog post on the development of Celeste. Development was not only a journey for Thorson, but for Celeste's main character as well. Now with the game being complete, Thorson is sure that the protagonist Madeline is trans, and the same goes for Thorson.
Thorson reveals their own struggle with being a closeted trans person during the development of Celeste, and as work continued on the project, Thorson realized their own feelings. Through this long process, Thorson has come to understand a lot about who they are, and the same goes for Madeline's journey. You can read the full blog post here.