I will say anyone who has done Eureka will easily pass this. I fought maybe 1 extra enemy I didn't see. All in all I didn't find it any harder than any other "weird character" instance and as to the story I can appreciate how it meant to take us down to trash mob level and strip us down to only our determination to save our friends from falling for a trap. The timer did make me worry a little and I think that's the point, to induce anxiety even if you don't actually care for your fellow scions. It was a little vague on where you were supposed to go with the map and no real directions, but once I got the idea that it was a giant half circle I just explored both sides.
There was though? I think I literally had the text on the screen "you have cleared out the enemies, continue on" or something to that effect. Though maybe they should just have the armor shut down and kick you out.