9.2
http://www.gamespot.com/gba/action/astroboy/review.html
"All game systems have two or three games that ultimately define the particular genre they represent on that platform. Thus far, the GBA's must-have action games have included titles from the Super Mario, Metroid, and Castlevania series. Now you can add Astro Boy: Omega Factor to that short list. You'll need to go through most of the game's 43 levels twice in order to find all the characters and unlock the best ending, but even after you accomplish that feat, this is the kind of game that you'll pick up regularly just to play a level and kill some time."
http://www.gamespot.com/gba/action/astroboy/review.html
"All game systems have two or three games that ultimately define the particular genre they represent on that platform. Thus far, the GBA's must-have action games have included titles from the Super Mario, Metroid, and Castlevania series. Now you can add Astro Boy: Omega Factor to that short list. You'll need to go through most of the game's 43 levels twice in order to find all the characters and unlock the best ending, but even after you accomplish that feat, this is the kind of game that you'll pick up regularly just to play a level and kill some time."