Did you play with sound on? The sound provides some context clues to the story and the behavior of the creature.
The dice control much more than acting as rocks - and it's a horror game so I was vague on purpose, perhaps overly so, but iteration should provide context on the behavior of the creature. At least, the goal was to learn what was happening through exploration and iteration.
Also, the control screen shouldn't advance forward until you press a button, but it's just WASD to move, lights and dice, so it seems like you got all the buttons down.