Has there ever been a rhythm based shmup before (besides rez if you consider that to be one)? I was thinking maybe something along the lines of destroying enemies to the beat of the game or maybe to every 4th (quarter) note to keep a combo. the bullets could pulse to the beat increasing and decreasing in size to make for complex and intricate patterns. bullets/enemies would have different note signatures besides 4th like half, 8th, 12th, or 16th notes. bullets with faster signatures would pulse faster making them harder to dodge, and enemies, well, you get where i'm going. I was also thinking that you could have different grades based on how accurate you destroy each enemy like perfect, excellent, great, bad etc, like any other rhythm based game. once your combo gets high enough you get a hyper that could change the bpm to increase or decrease difficulty/score, sort of like DDPDOJs hypers now that i think about it.
of course the bosses would consist of famous musicians playing there music. queen would be the last boss, and david bowie would be the true last boss. maybe the transition between the two could involve "under pressure."
just an idea, it would be nice if cave made it a reality
edit: another possibiblty: enemies get multiplied for every beat they remain on screen capping out after a measure
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