This game is very cute! I feel like S should be the button to increase Jude's weight and W to decrease it. It may be a bit of a skill issue but every time I play I load a worker or two on and my brain flubs the controls, smashing the elevator in the process. Also, sometimes when you send workers to the truck it sends more than expected.
Overall, I wasn't able to beat it but the art was adorable and the idea makes for a fun and challenging little game!