I love it so much
It's not a bad start, but it's very rough. You need to synchronise your audio better with the visuals. The cranking noises don't start and stop with the motion. The dripping sounds don't seem to have much relationship to the splashes that you've animated.
More actual movement in the plumber besides his wrist and wrench would be good. The first part when you have him climbing the building is OK, but after that he doesn't move.
You've done something odd with the layers because in a few places, background items are showing through the foreground. There's a line through the plumber's leg during the second "fix" and the crack on the pipe in the third fix shows as the plumber slides over it, but you've hidden the pipe.
Quite a bit to do, I'd say. Especially if it's for an actual client.