Pandemic is a Half-Life 2 movie made by anklove. While it's got its fair share of effects, this isn't some attempt at a blockbuster action flick. Instead, it does what Eastern European movies do best: turn the screws on a desolate, bleak landscape.
So, yeah, this isn't a feel-good project. At the end of four minutes you'll probably want to go play Half-Life 2 again, sure, but you'll also probably want to go find someone special and give them a hug. Maybe in a green, sunny park.