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Juno First a vertically-scrolling shoot-em-up viewed from a third-person perspective in which players must destroy waves of attacking aliens. Unlike other shooters of the time, the game's enemies don't line up in a gallery formation but instead move freely around the screen. Because of this, the player's ship can move both forwards and backwards (in addition to left and right).

As well as the attacking aliens a spherical 'space capsule' occasionally appears on-screen and if shot, it releases an enemy astronaut that can then be captured. This must be done within a set time, however, with the screen having a red tint for the period in which rescue is possible. During the capture phase, every enemy the player shoots is worth an additional 200 points.

As a last resort players also have the option to 'warp' to another random part of the play area. This is highly risky as it may place the player's ship in a position more dangerous than the one it left. Players are allowed three warps per level.

Starting formations vary from stage to stage and the aliens mutate into more dangerous forms the longer they survive. To complete a level all aliens must be destroyed.