In gameplay terms, the map is reasonably successful without doing anything special, in my opinion. At the start knights are everywhere and with only the single shotgun things can be tricky. Careful skilled gameplay is required, and theres not much health around either. Gameplay becomes simpler once the double shotgun and nailgun appear. Monster placement is basic, no major mistakes, but slightly predictable and not too difficult. Monster usage is a bit uniform and disappointing; too many zombies in the tunnels, more variation including perhaps custom monsters such as quoth's excellent custom enemies might have helped here. The ending is pretty simple too.
In summary, a nice map, but nothing really stands out as being outstanding or special.