Debbie's Diner Derby is a fun experience! The art and music are stunning, the concept is so fun and the physics feel very good! 

Only thing feeling a bit repetitive in my opinion is the level design. 
A way to handle it that would inspire more life would be scripted events for the diner NPCs. As an example, instead of having orders that come only when the player gives out the ordered food, NPCs could enter the diner at a set time mark, be a moving obstacle until reaching the table, order, and then after order is completed have the possibility to do other actions, such as ordering again or becoming an obstacle again when heading to the door.

Still, even in this state I think it's an amazing game!