Truck Bowling vs Rockets in space

About

A city floating in space, society in turmoil, two factions are at war. The Predators armed with RPG's and rifles attack the defenders, who are trying to seek refuge in the Fortress which they have heard has weapons and many secrets

The Defenders send vehicles down the ramp to destroy the Predators

The Predators try to shoot or blow up the Defenders by any means necessary

Defenders try to reach The Fortress to unlock weapons and the secrets of The Fortress