Zombies are always moving fast in video games. It makes sense if you think about it. Those games are all about hand-eye coordination and how quickly can you get them before they get you.
I really believe that you could do horror very inexpensively. I don't think it has anything to do with the effects, the effects are not the most important parts.
I think you're only free if you're working on very low or huge money.
There are so many factors when you think of your own films. You think of the people you worked on it with, and somehow forget the movie. You can't forgive the movie for a long time. It takes a few years to look at it with any objectivity and forgive its flaws.
I don't think you need to spend $40 million to be creepy. The best horror films are the ones that are much less endowed.