Most of last week was just planning on my part.  As for the team, we mostly just brainstormed how we were going to tie everything together and get the last few mechanics in.  We've had a few ideas for mechanics, but to do all of them would be out of scope.  Some things we brainstormed included randomization of rooms and collectables, blockades for doors and hallways to stop the enemy, and swinging ropes.  We presented these ideas in class and got excellent feedback in order to help us decide which direction to take.