there's no music, so rate the sound effects I guess?

keep enemies on screen as long as possible, 

graze, cancel bullets and bounce bubbles for score

grazed bullets and bubbles give better score items

SHOOT = X KEY / X-INPUT A

BOMB = C KEY / X-INPUT X

SLOW BULLETS DOWN = V KEY / X-INPUT LB

SHRINK = B KEY, X-INPUT / RB

RESET GAME = R KEY / X-INPUT Y

FULLSCREEN = F4

STRETCHED = F5

MUTE MUSIC = M

ESC = EXIT GAME (DOESN'T SAVE HIGHSCORE)

SAVE HIGHSCORE = R KEY / Y X-INPUT