what most people don't seem to realize is that the type of reflective screen used in gba can't be backlit. light emitted from behind that kind of screen will just pass through it, washing out the colors but illuminating nothing. to implement a proper backlight, they'd have needed an entirely different screen which might have been a prohibitive design choice.
oh yeah, and castlevania rox0rz my sox0rz... god what a kickass game.