Moon Quasar

Moon Quasar was produced by Nichibutsu in 1980.

Aliens swarm at the top of the screen, swooping down on your spacecraft. Your craft begins with three segments, one deployed at a time and after a few levels, you will attempt to refuel and dock the segments together. A successful dock gives you more firepower for the upcoming levels.

This game is similar to Moon Cresta (also from Nichibutsu) except there is also a “refueling” stage.