Horizon of Darkness

Next to the large red cross, the place where the imp led you at the very beginning.

Hmm... I thought that's where we started, and we went down from there, following the loot/levers. And the exit is the blue dot. But when it turned out it wasn't blue, I thought it was the center. So, what's in the center then, the entrance? 😕
It's complicated... I don't understand...