Awesome game.
The mechanics are simple and easy to understand, but they also manage to tie in perfectly with the story, and there's so much variety with the ways all the different terrain types interact with your meters.
That said, by the time I figured out how to make it all the way to the end, I managed to make it without having to worry about the FEAR timer at all (it was only ~halfway filled, and without using any refills), ahahaha.