Nice work on your first game jam. The idea is pretty cool and the game functions pretty well, but I do have a few notes.
Firstly the weapons need to be more balanced since they are randomized on timer. Otherwise it encourages a player delt a bad weapon to set around and wait for a good one. There's a famous quote regarding this: "If given the opportunity, the player will optimize the fun out of a game."
Secondly yellow text on a bright background is hard to read. This is why most games have a text box to ensure legibility.
Thirdly I did like how you associated the amount of enemies with certain office workers, it did give them some character when certain ones showed up, especially "John Infinity Gauntlet" as I've started calling him.