Thanks for playing! The conceptual reason for you not being able to move your tray really fast is because it's heavy and hard to balance for the monkey. There are also some technical reasons but mainly it made more sense because a giant metal tray is supposed to be heavy.
It fits to the theme because you're carrying "diced" vegetables. x) We thought everyone will go with the classic dice interpretation so we wanted to do something more unique with the theme.
Also yes, the point was to have kind of difficult and slippery controls because it's meant to be a rage game where you try to carry diced vegetables but they keep "rolling" and falling from your tray. :)
Thanks for the feedback. It means a lot to us.