Rainbow Frontline

Rainbow Frontline is one of the Shooting games here that asks for no download and no sign-up. Taps and swipes are the whole vocabulary — a phone plays it best. Its tags here are 1 player, 2d, airplane, arcade, pixel.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. It costs nothing and asks for nothing: no registration, no download, no launcher.