Clicking mouse once to progress dialogue is exactly what I want it to do, but it doesn't seem to do anything whatsoever, which is why I resorted to using spacebar.
[EDIT]: Oh, apparently you need to click *outside* the text box to progress dialogue. I'm used to clicking *inside* the text box.
[EDIT again]: Now that I'm doing it at a slower speed, I see that you... don't actually have autocomplete text. It literally just goes to the next dialogue block, even if the text hasn't finished. I've probably skipped a *lot* of text accidentally that I just had no idea was even there. That could be why the plot has been slightly confusing to me so far...