Zipper Interactive's tactical shooter, Unit 13, has been generating some hype in the US

The third-person shooter combines social and competitive gameplay to create a unique portable experience. In a new video — narrated by Zipper's Seth Luisi — the developer shows off a bunch of new gameplay, in addition to explaining the aforementioned social features.

The game's definitely got some neat ideas, but Zipper's got its work cut out communicating them to unaware players. We've embedded the video after the jump. Check out the PlayStation Blog for a more in depth interview too.