Thanks for asking, and sorry for the slow answer. Honestly, Threads is not built for portrait mobile yet. Its three screens (the flowchart, the ending gallery and branch jump) are laid out for MZ's default 816x624 screen, and they are driven by MZ's keyboard and gamepad input: arrows, OK and cancel. They don't handle tap, drag or pinch zoom. So in a 9:16 touch game it would not work well today. Touch and portrait support is a fair request and we've noted it.