Great list of games for one of my favourite systems - the GBA. What are your picks?

I'll always go to bat for Gunstar Super Heroes. It's a full on sequel to the Genesis game - hardly anyone seems to talk about it, which is a shame because it's incredible. Easily one of the best action games on GBA, if not the best. Absolutely deserves a spot in any top GBA list, right alongside Astro Boy Omega Factor.