What happens when you mix an arcade style shoot-’em-up with a rhythm game and then do it all backwards? You get the delightful (and difficult) Retro/Grade. Originally released as an indie game on the PlayStation 3, Retro/Grade has made the jump to PC.
Rhythm games and shoot-em-ups have been done before so the base genres are well represented in gaming. However, they’ve never been done like this.