It was a interesting little attempt at the survive until day genre. Besides the odd controls and lack of ingame first day instructions, there are three things I think could have been improved on.
First, there isn't really much of a reason to check on your shoulder once you realize the boss is pretty generous with how much texting you can get away with, even on the fifth day. Maybe if there was a employee that walked by that you had to wave at, or maybe to water a plant in the same screen would increase the value of checking your shoulder.
Second, the boss indicator should probably be by default on, or not a option at all. It removes the need of checking your shoulder, and removing it would make you rely on audio ques to know when to go to work (without checking your shoulder) would make for a more interesting difficulty.
Third, the difficulty isn't really that high for awhile. Ignoring my first day attempt (where I was learning the controls), it took until the fourth to get me close to losing, and the fifth to actually lose. There could be more potential for new gimmicks, but just increasing the AI difficulty by the third day to be closer to the fourth, and making the fourth closer to the fifth, that would make for a better difficulty curve. To be fair, there's a custom difficulty option, but it would be nice for the main game to be difficult to some extent.
Short, but fun little game. (I'm a bit late to the party, but might as well say something)