I should also mention something interesting about the credits music of HW2 which hints even more at FallFest, the ending theme is called "Scorched Cranberries Special" which is weird since there's no cranberries in either of the endings iirc. Well, cranberries go in season during the autumn/fall months, and scorched could be from... well, flames, tying once again back to FallFest. And since a few FNAF games like adding tie-ins in their endings specifically (MIchael's speech to Springtrap, the FNAF 3 newspaper) this is even more proof they want to focus on it more.