A few tips
One - up the frame rate. It's choppy & clunky.
Two - Work on drawing skills - put a bit of time into the drawings, they look like they were done on Paint.
Three - Improve voices. There were no signs of emotion in any of the characters (although the Russian guy was pretty good). I have no idea what that 'song' and the start was.
Four - Story. I'm not saying it should be an epic, but at least try to make it make some sort of sense.
Five - Lip Sync. Making the mouths flap in a clearly repeated manner does not make the characters look like they're talking - it just looks weird.
Six - Put a 'play' button. To make it seem a little more professional & to stop it looping - you can download buttons/ preloaders from NG.
You get a little credit for showing signs of effort, but you have a lot to work on... but don't give up.
:)