After about an hour of play, shot down almost every enemies and scored about 1.2 million... and tons of karma.
I tried to letting enemies go at first, but enemies kept attacking me for a quite long time after they moving out from the screen. doesn't know if it's intentional, but it felt more hard to not shoot enemies. (If it's not intentional, try testing on various screen resolutions?)
I loved game's atmosphere though, especially boss's design. it conveys this game and it's bullet themes. wind, rain, and thunder have their own patterns and they even reacts with corresponding karma cards!
Overall I enjoyed this experience. well done!