I played it a bit yesterday, and here are some things I noticed.
[*:122lld93]Your stairs are made for giants. Even though they are walkable, they look enormous and feel very HL1"ish.
[*:122lld93]Some of the outside water is looking very strange. It has some shader errors or so, as you have weird brown shading, then bright blue, etc...
[*:122lld93]Speaking of which, you allow the player to jump into the water. When he actually does that though, he just falls to the bottom of your map (but you already covered these 2 points in your own bug report).
Good work though, it's a very large and complicated map, easy to get lost. But it's certainly getting there!