Hey, a game for the GBA, how cool! My highscore was 43, got to see some wacky effects such as vision impairment one and the one that reverses controls. The music from the start menu is amazing. One thing that could be improved is the feedback when getting hit, but other than that it was a fun experience.
(I'm very curious about the underwater wavey effect, is it an animation or was there code involved to distort the background?)
Good job!