Orb Shifter is a Shmup based around the polarity mechanic also seen in games such as Ikaruga and Kyotokei. Players can absorb enemy attacks of the same color as their shield and must alternate between red and blue in order to survive.
Available for pre-registration on the Play Store: play.google.com/store/apps/details
More information at zrogameguild.wixsite.com/zero-game-guild/orb-shifter