Please help to find a short scifi animation film with a boy-looking robot from multi-level vertical world that was sent down to explore it. He was put into some capsule that fell down, and while it was falling, some mummy-looking creatures shot it down, and only a head fell on some level even further. The boy's head was found by someone who made it a new body. Then the robot-boy met some creatures who broke walls with their giant hands, then there was some kind of worms one of those sucked the boy in etc.
I believe this was a low-budget one-man-made pilot film, probably made by some Asian guy. It is a fun watch, and I hope it made it to some realisation.