Yeah, the level had a lovely, clean base architecture but combat relied too heavily on using the single-barreled shotgun: a huge chunk of combat situations were long range which kinda made the double-barreled obsolete. Nails were scarce and I couldn't find any of the secrets (wasn't really looking for them though).
Took me less than eight minutes on normal, didn't die although a few combat situations got pretty tense and somehow I missed 30 enemies. Here's a demo of my first playthrough:
http://www.mediafire.com/?ndydxmetd10