It's okay.
I wasn't quite impressed with what you had so far. Too much blur effects, no background, and I couldn't see what the plot would be for the final product. I did like the gun twirling and the characters' design though. My suggestion would be to read up a little more on animation, optimize the drawings so they don't look as wriggly, and keep working on your skills. I wouldn't give up on the idea you have, just take some time to refine it and you might have something here.