Could you think about making an extra trailer that primarily, quickly shows off various battles, unit abilities, character creation, weapon purchasing, weapon upgrading, flashing through the middle of the same battle 3 times at 3 different difficulties and so on, without the story introduction taking up the first 30 seconds?
I ask because the first 30 seconds of any videogame trailer are crucial, and most people aren’t invested in a taste of a story when they’re just browsing games. If they don’t see actual gameplay to hook them they usually just quit 10~ seconds in, I find. 