I quite liked the start of the map, wandering around with no enemies in sight. Don't know if it's the feel you were going for, but perhaps omitting the rotfish and delaying any other enemy encounters even longer would have made the buildup to the inevitable ambush even more suspenseful.
I'm generally not a fan of huge maps with hundreds of enemies and tens of secrets. One reason is simply personal preference, I tend to prefer smaller maps that take less time to complete. But an even bigger reason is the tendency to get lost, which did happen to me on several occasions in this map. Maybe I wasn't paying enough attention at certain points, but some areas seemed to be maybe a bit too interconnected, in that the correct way to proceed was too obtuse. Another factor that detracts from my enjoyment of huge maps is that looking for secrets becomes somewhat of a chore, as there's so much more ground to cover. I missed quite a lot of secrets, and subsequently kills, in the map, even though I feel like I searched quite carefully.
Anyway, it's not that I didn't enjoy the map at all, I did. Just setting personal preferences aside, I think if the layout had been more streamlined and less confusing, I'd enjoyed it even more.
skill 3, 192/211 kills, 11/18 secrets demo