The looking eye and the pestering hunger (The Prison)
New game mechanics is introduced here - the eye generates light and traces the protagonist. The way is pretty simple here - when the eye is looking as far right as possible, hide behind the bed and proceed further when it's safe. Remember to not let they eye catch you, or you'll have to repeat a portion of the game.
On the chest, you will find another torch to light. Climb to the very top and go right to the next room.
After a moment, the room will be invaded by a weird creature. Quickly hide underneath the bed. Wait until the creature moves left and go to the end of the room. Climb the chests, jump on the shelves and enter the vent shaft. You managed to escape the creature... for now.
Go through it. When you get to the other side, the protagonist will get a hunger stomachache. Go right - the creature will throw some food your way. Eat it. This will replenish your strength and will allow you to continue the journey. Jump on the chests and go further, go pass the subsequent locations until you reach electric bars.