YEAH (walkthru)
I love point and click RPGs!
It did seem a little bit weird, especially at the last part, how you can just stand around twiddling your thumbs while this huge monster is in the same room. But I guess that's unavoidable. Also it is strange, how did this monster get in the prison facility?
Anyway here's a walkthrough
In your cell: pick up soap, razor blade. Use razor blade on spare orange suit to get a scrap. Use the scrap to pick up the burning flesh on the ground. Use the burning flesh on the lock to get out of your cell.
Outside your cell: pick up the gun and talk to the insane prisoner. You'll have to be convincing to get his deoderant--say that the deoderant attracts the monster.
In the next corridor: note that there's another dead guard up near the top. Go to the corridor to the left and you will see a hand scanner by one of the doors. Try to use it; it doesn't work. Go to the dead guard and use the razor on where it says "dead guard's hand." You will cut off his hand. Try it in the scanner--it doesn't work because it's bloody. Use the soap on the hand to get it soapy, then go back to your cell and dunk the hand in the toilet to get it clean. Use the cleaned severed hand on the scanner to open the door.
In the control room: pick up the exit sign.
Back outside the control room: you have to do some careful searching around to find it, but just above the door there is a rusty nail. Use the exit sign with the rusty nail.
Back inside the control room: use your hand on the guard (slap him). You'll talk for a while and then you ask him to open the cell doors. The monster will eat him and you run out and slam the door.
Go to the sane prisoner (the screen just above the second guard). Talk to him and coax him out of his cell. He will run to the exit door (be sure you have the exit sign on the nail first). Open the door to the control room and the monster will eat him.
Go back inside the control room and pick up the box of matches. Go back outside and use the matches with the deoderant to make a flamethrower. Use the flamethrower on the monster. He will die and you will win.