Hey there,
this is actually (and unfortunately) a long running bug! Try to make your mouse visible on the screen, and move it around during the intro, and it should hopefully be active on the Title screen. You can double press space to skip the opening cutscene and speed up this process. Lemme know if that works
As a warning, there are also a few more pretty whack bugs (I suggest not walking into anything too forcefully or you may fly up out of view hehe).
Thanks so much for your time and kind words. I hope you enjoy the prototype!!