_*-- Fullscreen Recommended --*_ A and D keys to go left and right Spacebar to shoot The Boss only takes damage when it becomes a weird dark yellowish-green color I also recommend shooting at least one (1) spaceship before the end of round 1 and to fully upgrade "Faster Shooting" by the final round (round 3)
Music and (most) sound effects are from pixabay.com Time Taken: I didn't keep track, but I think it was between 11 and 14 hours Mother approved game "I hate this game!" -after losing "I LOVE this game" -after hitting spaceship