This isn't terrible, but it really, REALLY needs a lot work. For starters, don't fade in and out so long if you're going to do a one minute clip introducing us to your story, it doesn't tell the audience anything nor does it leave us for much an impression when all we do see is three people standing around looking at each other with blank looks on their faces. If your going to use those fade ins, use title cards in between each black out telling us a little about the story, characters, locale, or anything relative the animation your presenting. If this is an ongoing series that I'm not aware of, then try to make it so its more welcoming to newer audiences who have never heard of Double Dragon or whatever your version of Double Dragon is.
The title "Double Dragon" itself needs remodeling. Don't use basic colors like red and blue, use font styles that complement the background/setting/art style/etc. and transition it into view matching the mood your trying to set. And I'm assuming this has nothing to do with the main series, so I'd suggest a subtitle like Double Dragon: Armageddon or something.(It doesn't have to be as cheesy as that but something other than DD)
The animation, what little there was, needs an overhaul. Don't use the basic sprite sheet to animate your toons, use Microsoft paint or somethin' and make your own unique animation using these sprites as a base and build from there.
From the first moment I heard the music I thought that this was either going to be a mystery or horror/suspenseful flick, if you were intending on making this like the original Double Dragon Series, I'd advise more action packed music. But if your aiming for more horror... well... lets just say using Double Dragon Sprites probably won't invoke much terror in someone, or leave them in much suspense when they're not even doing anything in the first place.
When it comes down to it, this was just bland and uninteresting I'm sorry to say. My advice? Look at other people's pixelated works and learn from them. Learn transitioning and setting the mood for your story, write down a storyboard before you start animating. You can do this if you just push yourself and learn. Cheers, pal. I hope you do better next time.