I think the game looks very nice, is fun and the concept is amazing!
The music is also nice, although i thinkit does not fit the game (at least during rounds) very well, its very relaxed and chill, which is like the opposite of a stressful restaurant and hurriing to serve your customers!
Thats the next point, i think the limitation "limited time" is poorly implemented, yes, the customers only saty for a short time period, but i dont think thats enaugh!
A easy trick to make your game look a bit nicer, is to swap out the default font for another one!
Also sound effects during the gameplay are missing, which is bad, but acceptible for a gamejam game!
All in all great game!