So you are trying to create a game? and you need a great imagination to help you with stuff, then maybe I can help...
so let's see Rpg format, you have got your towns and cities,right?
Characters, you have lots of info for, weapons?
I would say cutscenes would have to be about three minutes long to build the story, but not over hype it.
having a few npc's being ripped apart by some large creature, that has gone mad might have a good appeal to some.