iirc from the original (fuzzboobs is FUNCTIONALLY very similar from what iv seen)
Freddy has a pre-defined route that he follows, viewing the camera he's in stops him from moving (main difference i see is in fnaf, viewing the camera is the same effect as his AI being 0 meaning he'll fail every movement opportunity where as in fuzzboobs, if she succeeds, she'll move when no longer being viewed) the only time he moves backwards is if his next move is the office but the door is closed