I believe the ending is left vague because it’s intended to be a work of interactive fiction and we’re supposed to write the movie’s ending ourselves. It’s our own version of The Pink Opaque.

I officially made the decision to transition like a week before watching it and that was the conclusion I came to. My own experiences were pretty dead on in many ways to Isabel’s, even right down to the age/time period, so when I watched that ending I felt relieved because I knew that I had already escaped. I feel like I had essentially written the real ending before even seeing the film.