Nightmare demon & mechancal twist

Mechanical twist
It is the chapter one boss so you have to kill it and collect the keys on it to unlock the elevator and complete chapter 1.

nightmare demon
he is the chapter 2 boss meaning You must destroy him to beat the chapter. He has spikes on his arms and looks like he may be used for attack. The purpose of these spikes are still unknown.

FNAT UCN
"robots, yet we have minds."

-mechanical twist & nightmare demon