Thanks for the kind words, Hosasy!
I'd have to agree with all your comments really. There are some oddities to the physics on the chain, it's probably because they're too realistic for what is actually a very unrealistic scenario. The jetpack was weaker only an hour before the final build and the ball had a much greater mass for most of the development too. I fine tuned the physics at the end of development but I knew that it still had room for improvement unfortunately.