Is "Literally everything" an acceptable answer?

> Rebuilt the environment entirely
	> Created a fully furnished apartment
		> Bedroom
		> Living Room
		> Bathroom
		> Kitchen
	> Created a hallway to emulate an apartment building
	> Created background buildings to emulate a city
	> Created a stairwell
	> Created an "office" with multiple rooms
> Changed the skybox
> Changed the scene lighting values
> Added fog to the scene
> Created see-through windows
> Created a system to pick up and throw physics based objects
	> Added the ability to pick up and drop objects with right click
	> Added the ability to throw objects with left click
> Created the ability to shatter windows with thrown objects
> Created interactable doors that can be opened and closed
	> Added the ability to open and close doors with E
> Added a system of teleporting the player from one end of the hallway to the other to create the illusion of an infinite hallway
> Added a system of teleporting the player from one end of the stairs to the other to create the illusion of an infinite stairwell
> Added a system of teleporting the player around the office to create the illusion of having too many / too few rooms
> Added a tutorial explanation in the bedroom
> Added the ability to limit objects seen behind glass
> Added an ending to the game
> Added the ability to restart by pressing R
> Added a cursor

