Did you read the posts above you that showed you how to adjust the walking speed?
The mod has much less visual detail, and a couple of spots are different. But the overall narrative, island, structure, ending, etc. are all the same.
It's like a fully-functional prototype version of the game.
Very cool!
I like stuff like this a lot.
I need to play Amnesia now, I have put in about 20 minutes but wasn't the right mood for it. I know it's not that similar...but still.