So I'll start with a couple issues I found.
First off it seems if you continue after getting a game over from reports, it messes with the timer. The clock seems to start at the time you failed, but counts it as the start, leading the lunch break being at the wrong time.
Second, it seems like a manager being present when lunch kicks off leads to them not appearing in the afternoon? Maybe them not actually leaving prevents others from coming until the day resets?
Beyond that, full corruption leading to the employees doing things themselves is a good idea, be interested to see where it can go from there. Could see this being a start for corrupting the visiting managers, would make for an interesting way of unlocking the next level