I think this game has a lot of potential. It's a simple, straightforward management sim. However, right now, like John Ivess said, it's too slow paced. I think solving this could be as simple as lowering the time to prepare food and reducing the cost of upgrades, although then you may also have to change some other stats to keep it from being too easy.
I think the ui would be better if clicking on one object and showing it's action button hides any other action buttons currently on screen (for example, if you click on the stove, then click on the break room, the bake button hides itself, so that all you see is the rest button).
This is a very small note, but I once saw a bug where two people were sitting in the same chair :)
Overall, good work! It just needs some tweaking.