I think the four "levels" might actually be the transition the level takes, when some of the objects switch around. I think the level quickly alternates whenever you pick up a flag to a separate level, where objects are switched around.
Yeeeah :/ it seems like the two first levels are associated with the tape you click in the beginning, another one is for the secret paper ending and only one of them is the actual map... but there appear to be emoji textures that don't seem to be used anywhere in the game...oh well, I downloaded Unity over nothing :P