Soo... I had to just smile at the title and I immediately clicked on it.
The presentation is awesome, theme fits perfectly.
The only thing I am missing, is a bit of action, since just walking around cleaning things is not my type of game. So:
The cleanup needs to happen during the battle royale. (Like the employees are rushed to clean up as soon as possible to save time, some kind of lore like that will fit)
That would add the element, of trying to survive still, while you cleaning up the stuff.
Still a really funny idea!
If you have some time, we would love also some feedback for our game :D