besides vanity stuff like more assets, music, sounds, and so own...
three systems, the the nightmare that was cookin the game make me afraid of open the blueprint
the first is making so if there was more than 7 of a certain statue game over for you, thecnically i can, the problem is that i cant because the game didnt count when said statue was destroyed
the second is unlockable notes, with some flavortext about the ghost that haunts this place, the guy that work before you, maybe a note about how the doctor was ready to end his day but saw a strange statue out of nowhere
third and definelly one that i wanna work is make the game winnable, and custonizable, like you play the shifts for a week, each night harder than the predecessor, and at the end you get your pay and leave or play a bonus 8 night with custom parameters, but rn the game is only survive as long as you can