WTF is limbo?! ( YouTube video )

[BromeoGaming]

Hey bros!

So first of i must say, thank you to the guys that took time to subscribe to my channel here when i posted last time. Thanks!
Im a Swedish Youtube partner that makes gaming videos and stuff, and in this last one we have tried the map Limbo for Amnesia.
And we couldn't understand anything about the map or the ending!
haha.
can anyone explain some stuff about the map and what it is all about?
Sorry but im a Amnesia noob but this game is frickin awesome and i wanna get in to it.
Thanks!