It was made specific for the game. There is a short GIF on the gamepage showcasing it a bit. It's a large black box that you stick your arm into to play.
It's actually much simpler! It's long, thin metallic switches that you press with your finger tips. They are positioned in a way that you'll curl your fingers in a similar way to what is displayed on screen. It was made using an Arduino Uno kit, it's not overly complicated but still very effective at creating a sense of unease through it's presentation/tactility.