No revenue estimate for PSN — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $0 — a different platform, not this one.

Planetary Defense Force

Jump into the shoes of an interplanetary defender! Grab weapons, build towers, expand ground economics and protect planets from space invasions. Suit up, engage all of your defenses, pick a weapon and wait for aliens to come. As part of a Planetary Defense Force (PDF), you are tasked with protecting planets in this unique mix of twin-stick shooter, tower defense and city builder game. Move between the planet and defense sphere during the assault to manage both towers on top and economics back on the planet. Defend against many types of monsters and huge bosses. Planetary Defense Force is a beautiful visual experience with a lot of bullets, colors, explosions, lasers and mayhem. Become an ultimate Defender.