Gravity Bone

Everyone need to check out this game now! It's only about 20 minutes long, but contains the music from Brazil, and is amazing.

It runs off the Quake 2 engine, but it's not a first-person shooter. It's more of an adventure/platformer, though there's hardly room for any of that. It's mostly running fetch-quests through a series of hilarious setpieces. That may not sound very appealing, and admittedly, the core game design is rather pedestrian, but it's so short that you're not likely to get bored of it for the scant few minutes that it lasts.

It's basically a spy/noir/sci-fi kinda thing, but the jazzy style and colorful aesthetic give is a life of its own. The way it makes fun of the spy genre and action movies is a joy to behold and the ending, in particular, is single-handedly the funniest game ending I've seen since Portal. Enjoy!