> i'm curious about the invisible enemy near compendium at basement. what's that?
it's the Watcher that followed Morag back from the Black Island and which grows stronger as the water levels rise. there are numerous references to it in readables scattered about the map. it's also a riff on a famous encounter from "Amnesia: the Dark Descent".
I played 1.1 and watched 1.0 playthrough. They're hardly TOTALLY different. Main difference is that some enemies can be defeated (you don't need to sneak past them, but I should say that sneaking is mostly easier and quicker) and there's one forced duel where you need to duel a haunt for a minute straight in the original, but in 1.1 he dies a bit quicker. Everything else is nearly the same, just a bit more palpable.
It's up to you, of course, to keep these releases separate.