Shoot-'em-up 2

Shoot-'em-up 2 (かえってきた シューティング), known as Shoot-'Em-Up (シューティング) in Rhythm Heaven, is the 2nd Rhythm Game of the second stage (7th overall) in Rhythm Heaven and the 2nd of Citrus Tower (44th overall) in Rhythm Heaven Megamix.

The short version, Shoot-'em-up, appears in Citrus Land in Rhythm Heaven Megamix.

The arrange version, Shoot-'Em-Up 2, appears in the tenth stage of Rhythm Heaven.

Gameplay
The player controls the Blastronaut on a mission to stop aliens from invading Earth. The game is played in first person view from the spaceship. A varying number of aliens appear on the screen one by one in groups. After four beats, the aliens attack. The player must attack them in the same order and timing, relying on the rhythm of the music. If a beat is missed, the alien is missed and damages the spaceship. The Shoot-'Em-Up Radio Lady appears at the start of each wave and the end of the game to give advice.

Endless Game
Shoot-'Em-Up (シューティング) is the 2nd Endless Game in Rhythm Heaven, unlocked with 7 Medals.

Gameplay is about the same as the non-endless version, but differences appear:
 * The player has a life bar which is depleted with every miss. If the player is hit when the bar is empty, the game is over. The life bar gradually refills after being depleted any amount.
 * The player receives points for every successful shot in a pattern, going from 100, 200, 500 and 1000. Defeating every enemy in every half of a wave awards the player a "PERFECT BONUS" of 1000 points.
 * The Shoot-'Em-Up Radio Lady doesn't appear between waves, instead she congratulates the player for reaching certain scores. Reaching the end of a wave instead causes a warp effect, which changes the background. Notably, the last background is the same as in Shoot-'Em-Up 2, after which the set of backgrounds repeat, but with a different color.
 * Once the player has reached the end of the non-endless game, the last three enemies do not appear. Instead, it goes to the last two waves of Shoot-'Em-Up 2, after which the waves are randomized. The enemies also change shape for the rest of the game, which have stricter timing. Internally, they are known as "enemy_mini".
 * After clearing 20 waves, the music becomes quieter. After clearing 30 waves, it becomes muted completely.

Skill Star
The Skill Star appears at the end of the fourth wave.

Challenge Land
appears in the following Challenge Train courses:
 * Game Gamble: Intermediate
 * Spaaaaaaaaaaaaaaace!

Trivia

 * The green aliens that are seen in one of the backgrounds during the Endless version of the game are the Space Umpires from Spaceball without their spaceships.
 * In Rhythm Heaven Megamix, the background in the epilogues comes straight out of Wario-Man's stage in WarioWare: Twisted!
 * In Rhythm Heaven Megamix, the Shoot-'Em-Up Radio Lady is shown through a CommPad, which resembles a Wii U GamePad.
 * In Rhythm Heaven Megamix, the aliens are fully grey with a green glow around them. Coupled with parts of the player's spaceship being green, this makes the game resemble the Shoot-'Em-Up 2 in Rhythm Heaven.
 * This is one of the few games to keep the same controls for tapping from Rhythm Heaven to Rhythm Heaven Megamix, the others being Munchy Monk, Freeze Frame, Lockstep, and Fillbots.
 * In Remix 10, the Practice enemies and yellow background are used instead of the game's default appearance.