The Genre was pulled out of a hat, an actual hat.
As for going back and making it homogenous... if I were actually writing this, then... well, "homogeneity" wouldn't be my actual goal. I would go back and change choices that I thought could be improved.
(You actually hear me do this in the podcast.)
The other thing that I notice during these exercises is that certain choices are "forgotten". They are added to the storyform, but nothing specific seems to be built off of them. I would go back and change those, or at least reconsider them.
This really isn't that different from any story, though. You put up a bunch of ideas, keep the ones you like, and adjust the ones you think can be better.