It's not bad... but...
I thought your animation was very fluid, but the graphics (as far as the people were concerned) was a little... sub-par. Also, is there really any story to this animation? It kind of looks like another one of those "Invincible-One-Man-Army-Man-With-Floating-Limbs" type of cartoons. He just goes around murdering people for no apparent reason and it never really makes any sense. Some sort of a story would help out a lot. No offense to you or your animation/cartoon, but I think you should focus your skills (as well as your friends' skills) on something more unique. If this is your very first animation, then you've definitely got the talent and skill to far surpass that of a random killing, floating limb character cartoon. I encourage you, however, to continue this one and make a sequel, as this experience can only add to your overall skill.