Thank you for the game! This looks very interesting.
I've run into some difficulties, though, with the rules for the "Level 1" difficulty.
Level 1 states: "No guest may receive their first portion until all serving dishes are filled with the required cubes." But if all serving dishes need to be filled before any guest is served, then you may be forced to lose the game before it gets properly started.
Some of the royal actions listed on the royal host cards require you to move cubes onto or from a guest plate (e.g. "Move a cube from a serving dish to any guest plate", "Move a cube from any guest's plate to another guest's plate", or "Move a cube from a guest's plate to any waiter's tray").
But since you cannot move a cube onto a guest's plate until all serving trays are filled, you cannot perform these actions, and as the rules state "if you cannot perform the royal action, the game ends immediately".
So, it seems like you automatically lose the game if you draw any of those three royal host cards.
Or did I misunderstand the level 1 rule?