Hey
Not bad at all for your first claymation. I really liked how you set up the battle as a turn-based RPG. The animation looked good, but could stand to be sped up a little bit, I think. Also, when the guy shoots the gun, adding some sound effects for it may be a good idea. Now that I say it, adding some general "combat-style" sound effects would really make this more interesting.
Overall, a great first claymation, you've got some skill, keep it up!