Retro Galaxy is a galaxy close to the Milky Way. It's a dwarf spheroidal galaxy about ten thousand light years in diameter. It's based off of Space Invaders, due to the space background being green in this area, and enemies based on the aliens from that game being present here. It also seems like this galaxy resembles space around Earth as it was decades ago, due to Sputnik 1 passing through in the cutscene.
Ion Blaster Gift • Neutron Gun Gift • Laser Cannon Gift • Vulcan Chaingun Gift • Lightning Fryer Gift • Plasma Rifle Gift • Utensil Poker Gift • Boron Railgun Gift • Photon Swarm Gift • Positron Stream Gift • Atomic Powerup