Liked the office theme.
Hitting colleagues and drinking coffee to heal.
Liked the level system, it is just like Pokemon!
I understand this was a gamejam game and you had limited time, but if you had more time I would suggest the following:
Played the game twice to explore new things, but it seemed too much of the same hence I lost reason to play. The floor number is just a value, and has little meaning on it's own as a high-score, you need to give the number value. For example the player levels up and gets stronger, new abilities are unlocked. Floors get new weapons, enemies etc.
Where is that machine gun?
You already build a level system. This could be a great way to add value.
I already noticed you got stronger when you level up, display this! So it is clear progress is made. You could unlock abilities like dashing, magic spells like fireball (stick rpg),
super saiyan like abilities get stronger unlock ability to do kamehameha.
To make it more interesting you could give the player points on level up to
develop certain skills: strength, mana (for kamehameha), charisma (manipulate colleagues to become your allies). This way each time you die you have more reason to replay, you could try a different "way of life" each time. Become the strong pure or pure charismatic, or a mix of some.
Also I would expect when you go next floor you get better weapons.
PS: if you did ad new abilities, weapons, interesting things start doing it after the first level up or floor complete, then I wouldn't have missed it.