Teaser, eh?
It looked more like an introduction than a teaser. Pretty much nothing was shown, besides a series of short story-building paragraphs, each describing a generic story. It starts from nowhere, doesn't situate us, and says: "Mister X. = city in danger.", and the line after it says: "The city pleads for help to end this madness". We have no idea where or when it happened, or how. Quite annoyingly, you left 10 seconds for each 20 word paragraph, and the thing had quite a lot of slides, so you ended up getting bored rather quickly, in the absence of a "skip" button. It then continued with more slides, and ended.
Quite honestly, your teaser failed to provide the required element to bear its name correctly. It did not tease me. You didn't show any action, only story slides, so I'm not really looking forward to the first episode. I assume it was only an intro to get the story out of the way and skip to the fighting straightaway when the real adventure starts.
Well, I think it would have been better to invent a story with your own characters and ideas, but since it's a sprite movie you're making, ok.
On the bright side, the choice of music was excellent and thesubject seems rather interesting. I've never seen a Streets of Rage flash before, so there you go. Amaze me.