Progressive UFO is a boss first appearing in Stage 4-3 "AT-rich". It recurs in 5-3 "Canonical Genetic Code" and 5-5 "Perikaryon".
Appearance[]
It resembles many disembodied mechanical parts. It may at first look like its upside down, but upon firing pillars, the body reverts downside up, showing the true body, based from the original UFO.
Behavior[]
Each part moves and fires a variety of bullets and lasers. The far ends of Progressive UFO fire normal bullets that can be destroyed by the player. The two cannons that surround the central piece fires lasers at the player anywhere on screen. When the player has not been hit yet the central piece fires pillars and all the components arrange to resemble the UFO. It fires a second barrage of pillars in either the left or right direction and flies horizontally between the pillars. If the player's ship does not make contact with the pillars on the second barrage, half of each pillar is divided up into pieces and Progressive UFO returns for another flyby.
Name[]
It is named for its status as being a "UFO in progress."