Playstation blog writes: The inspiration for Comet Crash comes from traditional tower defense games, but we think it's time for some exciting twists.
Generally in tower defense games, you build up weapons to protect your base from oncoming rushes of enemies. Killing enemy swarms is a lot of fun, but isn't it time to take out the nest? In Comet Crash, you use a variety of weapons to defend against enemy rushes, and you get the chance to fight back. The real objective is to rush the enemy base with your own offensive army!