I kicked off Day 3 with a couple hours before work.  Yesterday and today I got in:

• Improved dungeon generation
• Breakable objects
• Rough monster pathfinding (Doom-style, I didn’t tackle anything like A* given my 7-day time limit)
• Monster factions and aggro (they currently love attacking each other a bit much)
• …and Fog of War in LOS!  BAM!  (Okay, I used a library to shoehorn it in quick, don’t judge me)

Coming along well.  I still need an item system to drive gameplay, a UI to support it, and a lot more interesting world.