Cool concept, I thought about doing something like this.
I like the spritework for the characters/food/fly, but a lot of the background tiles and such don't really fit in. The blue tile is a bit blurry, and the tables and chairs outside the playable area are way too big. There's also vertical lines on those blue and white tiles.
The primary mechanic doesn't always seem to work when I press a button. Are you checking for input in FixedUpdate?
I feel like the walking speed is too slow. Sometimes a dish will spawn clear on the other side of the room, and you won't even be able to get there in time, let alone interact with it.