Locked in a cell you keep yourself occupied.
On the floor is a piece of PAPER. Take it. On the table on the left is a bottle of GLUE and on the right are bottles of PAINT. Take the BRUSHES from the lower left corner of the easel.
In the inventory use the glue on the paper to create a face-shape. Use the paint on the paper and use the brushes on it to paint a face. Use the painted mask on the pillow of the bed to pretend someone is sleeping there.
Feel under the pillow to find a SPOON (keep the index finger of the icon on the right eye of the mask). Use the spoon on the grating on the right of the wall to dig a hole. Use the hole and you’re free.
Game source: A copy of the game was found here on the internet.