Jenny is right, it's the triangular button that advances the dialogue. I waited a little and clicked again, and the first bit of prologue advanced, but I couldn't advance after the second page. I waited a bit but it didn't work a second time, I couldn't get to an instruction page. I could still hear audio and button clicks, but the text stayed the same.
(Edit: Also, this is in the browser version, I have not tried the downloadable one.)