weeeessseesW and S for player 1 and up and down arrows for player 2. E to spike with Player 1 and the left arrow for player 2. If you don't time the spike well, it will either not work, or you will get a faulty serve which is when you spike it behind you.
@SuperSirrah for all effects and code. @theChAOTiC for some sounds. @theChAOTiC and @the_Updator for inspiration for the effects.