Killzone: Mercenary gets 30-minute walkthrough

A 30-minute gameplay walkthrough for PlayStation Vita shooter Killzone: Mercenary has been posted online.

The video is of a preview build of the game but it's already looking impressive, ahead of its September release.

Watch the video below.

Killzone: Mercenary is in development at Guerilla Cambridge in the UK, which previously worked on LittleBigPlant for the PSP.