Hi! Good work with the trailer. <3
Maybe I felt like it was a little bit quick beacuse you tried to put a lot of scenes on it to reflect the whole game (except the climax obviously xD)
You can maybe think the main features of the game and put a little text with a quick example in-game.
Like: "Face the creatures of the night" (picture fighting a vampire)
"Or turn yourself into one" (bad ending picture)
"Help Mila to discover the secrets of her past" (picture of a malisphere or some character hidden)
And then fill the rest with effects, pictures and fireworks xD
Also I would like to hear The Apex song in the trailer or maybe the Castle Entrance, that one are the best of the game soundtrack.
Hope the ideas be helpful and again great work n.n