Movie of the Game
I know this isn't a movie of the game, but there's nowhere else to talk about it, and Valve is planning to get something made.
So yeah. It ought to qualify as an art film. Something not Hollywood, something untraditional. Why not make a first-person movie to match the game? No dialogue from Gordon Freeman, no third person shots of him, just all from his perspective in the hazard suit. Maybe every now and then we might see him in a reflection.
I just think it'd work better that way. Anything else wouldn't be Half-Life.