It kept my attention, the new trailer that is. Which is always good news. It seems like a decent short film. And the rhythm of the trailer was well structured. I'd have to recommend you give it a bit of a color grade, so it does not look "plain" if you get my meaning. I can understand if your intention is to keep it more "classic" sort of like Nolan likes it, as his films seem to have literally no color grading (or just very minimal 'touch ups') but if that isn't your intention, make it more cinematic by raising some contrast, and such, if you know how to do it. That'll give you a more 'mature' like look to your film.