You have a jet pack and you try not to be eaten by a Tyrannosaurus Rex. Even before you see both in action in the trailer through the break, you should already be sold on Orion: Prelude.
Based on the Orion mod for Half-Life 2, Orion: Prelude is the debut title from the indie Spiral Game Studio.
No release date yet, but you can register for the multiplayer beta on the game's official site.
Rock Paper Shotgun had the trailer below.