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

[Googolplex]

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.