Star Avenger 4

Star Avenger 4 is reminiscent of both Space Invaders (or the third level of the previous game) and Choplifter. From the former, we have a vessel that moves horizontally across the field, firing upward at invading extraterrestrial forces. We get a rescue operation from the latter. Navigate your journey across the lunar wastelands, rescue a stranded human, and return your chargeback home.

Mechanically, this is straightforward; the people in front of you serve as keys, unlocking doors behind you. Go back and forth, fetching, unlocking, fetching, unlocking, till you're finished. Play Star Avenger 4 online on Classic Reload and enjoy the game.