For anyone playing who needs the controls:
WASD to move
Spacebar to take a customer's order and collect ingredients
After getting them from the fridge, you have to put the burger patties on the grill and wait until it says they're finished
Once you have all of the ingredients for an order, assemble them at the cutting board with Spacebar
Then go deliver the burger with Spacebar again
E opens your supplies/upgrades menu