Missing enemies!!!!

[Tommy Gun]

Hi, i have penumbra Overture and really enjoyed playing it, but when i look back at the screenshots from the website, i find that i haven't encounterd the giant spider from the water cave, or the dog that attacks you after the "tongueless man" is dragged away, leaving a trail of blood in the old storage.

I think it might have something to do with the triggers and any help is greatly appreciated

P.S i downloaded the game of the frictional games store.