It's not bad, but there's not much to it. No story, no characters, not even a real joke or setup to the robot being hit with the slingshot. Maybe you could've had the boy trying to hit various fragile objects and the robot keeps stopping him, which would justify the robot itself getting hit with the slingshot, or something.
I don't know where you can go from here but I'll be watching the next minisode. Keep up the great art work!