Great, complex game!
I loved it! It was really interesting to see how his mood changes and his random actions.
Here are some tips:
Try every job until you find his "favourite job". He earns the fastest on his fav job.
If his energy is zero but he's not sleeping, send him to work and he'll return right away to take a nap.
There is a clue on the cell window.
Buy more donuts, they improve his mood and health.
The amount of 'respect' doesn't makes a difference, except he says random messages about how he doesn't respect you.
'work ethic' is redundant (it seems so to me).
Hope that helps. Good luck!