Need map, replay map button
Perhaps I am missing something, but it seems the only way to replay a map once you've missed it is to quit to the main menu and start over.
The other problem is that you can't see more than 10 feet in front of you especially if you're moving vertically. You need an overlay map that shows where you are and where the incoming walls are going to be, or else you need to just zoom out the view so you can see more.