Here is some ideas:
* How about when the player pays to get the Promotion upgrade they get moved from the Cubicle to a Basic Office. Then Promotion upgrade goes from a Basic Office to Personal Office. Maybe even key certain upgrades with player's position in the Company.
* Maybe allow the player to Capture/Tame the monsters when at the highest position in the Company and with the required items.
* Don't know why but a version of Mal0 (S.C.P.) and the Bracken (Lethal Company) somehow finding their way into this would be an interesting crossovers then it makes me think of the Human Dogs (immunization shots for the player).
* Will there be a case were there will be multiple monsters on the map?