Your nightlight is gone Amber...Eternally Us
is a short Point-and-Click Adventure Game
by Steven Poulton and Ben Chandler about a girl named Amber who is looking for her disappeared friend Fio. It is freeware
and it is really short, so just go play it instead of reading this article. You'll be weeping your heart out
by the time it is over.
Official website is here
(here's a mirror
if that link doesn't work).
The following list assumes that you have finished the game already, so unmarked spoilers follow
The game provides examples of: