What do you think is the #1 monster in the Frictional Games Penumbra & Amnesia?

[The Rock Worm]

Justine is too hard for me. I never played the game to the end.
I'm familiar with the controls perfectly, but when the monsters come, I can't find a way to escape.
They're always coming to me and they are little faster than Justine. So they catched me always and then I lost fun to play again. I watched letsplays how it ended.
I would prefer when there would be two save points in the game.
Otherwise the game is frustrating.

Now I never played Justine, but in case of faster monsters, all I can say is to move into a room and close the door. Then you have a few moments to hide or run some more. That or put yourself in between heavy boxes.