Not bad! Script and voice wise this is fairly funny, so most improvements would mostly be coming from the animation itself.
-Your characters usually stay in a single pose while talking. If you added some additional movement, such as blinking or arm/body movements; they would seem less stiff and become more animated.
-Lip sync is pretty good! This is a minor critic, but I would suggest you double check line thickness when you use a shape tween for mouth movements.
-For future explosion scenes, having glass shatter or having debris fly out will add to the devastation effect you were going for.
Some improvements here and there and this will be even better. Keep it man! :P