A game with a straightforward premise, offering a reasonably obvious goal, but takes place in an environment which does not have you in mind.
I’d suggest trying it, but “spoilers” are further below!
CAPTURE THE FLAG, FOR ONE (Windows)
As the player carries out the suggested task, the glacier below will shift and melt on its own. Though almost impossible to see, each time the flag is returned a tiny tiny portion of ice will disappear, which slightly speeds up the process of collapse. Intended to be played over a much much longer span of time, the version here probably takes about 5 or 6 minutes.