Robo Aleste, known as Dennin-Aleste (電忍アレスタ) or Dennin Aleste: Nobunaga and his Ninja Force in Japan, is a vertical scrolling shoot-'em-up developed by Compile exclusively for the Sega Mega-CD. It is part of the Aleste series of games, and the only one to use the Aleste name in all regions.
You control the flying robot with the directional keys. It comes with two fixed options in front of it. These absorb enemy bullets and cause damage on contact.
Holding fires the options away, is for shooting and for changing movement speed. The standard shot can be powered up by collecting small powerup pellets. There are also 4 extra weapons. Blue is a piercing laser, green fires shurikens, brown is for bombs and and yellow gives the two options limited homing capabilities.
It should be noted that, as with many others Compile shooters like Seirei Senshi Spriggan or Super Aleste, power ups reappear infinitely during boss fights, which are not time limited. This way, infinite score can be accumulated, thus making the score counter obsolete.
The game was made easier for the release outside of Japan, e.g. Aleste's yellow homing orbs became much stronger and the steady increase in rank was toned down. The NTSC-J version had plenty of character dialogue stored as Red Book audio tracks on the disc, but many of these tracks ended up being unused. The respective dialogues simply appeared as text.