Yes, the Playstation does have 4 face buttons, but the game uses only 2 during gameplay, it is best to use both accordingly, but, i also just so happened to have beaten the game with just one of the 2 face buttons...
Just like actual Volley ball, you can lower your hand to reflect it to the top, or, raise your hand to reflect it straight ahead. Turns out you can do it just like a lot of school girls, only bother to lower your hand to reflect the ball all the time and not use either accordingly.
But, do i recommend doing that? Absolutely not.
But you can try it your self if you feel like it.
Actually... I used to like this game more than Lunatea's Veil at one point... What was i thinking... Maybe it was more fun, but, eh, heh.