Their product page for Night of the Sacrifice says you can use the Balance Board to virtually walk through the game. Players also use the remote like a flashlight so I suppose Marvelous wants players to feel like they’re in the game running away from creatures with that have their eyes and mouths gouged out.
Another interesting tidbit is Night of the Sacrifice’s story is broken into chapters. You’ll gradually uncover the mystery of why people are being sacrificed to the gods as you run for your life. Clearing one episode opens up the next.
Night of the Sacrifice is slated for release on March 24 in Japan.