So, I heard this game comes with a PDF manual that also comes with a lot of informations to make the game a bit easier to get into. It seems, though, that GoG did not get the manual. At least I don't see it in the extras,
Is it not included? Will we get it at a later date?

For now, I just jumped in blind and took some informations I found on the steam forums. I still get slaugthered on the first floor but at least I start to survive more encounters in a row and figured out how to rest to get HP and SP back up.

The manual is included in the game build for convenience. Check the install folder, you can't miss it.

Ah, there it's hiding. Good. A few other games have the manual available as extras for reasons, so I was a bit confused.
Thanks.