Here's my idea:
A shyguy with a Dropper and a paintbrush. The shyguy would start frail, looking crumpled, in black and white.
They'll sap ink (From that color meter we saw in the trailer) with the dropper, which will cause them to gain color, depending on which ink color(s) they sap.
They...
For me, Wet Dry World from Super Mario 64. Specifically the city.
It's hidden away, and the city itself is completely empty.
It kind of implies that the inhabitants met a watery grave, and the buildings are all that's left of the civilization.
And if you ask me, that's scary.