if you like minish cap, i'd suggest you get zelda: link to the past as I think it's a better game. Though you may already be emulating the snes version of that game.
Advance wars 2 has come out already.
If you like tactics ogre, why don't you try final fantasy tactics advance as well (expensive tho).
Harvest moon is actually a very good fit for a portable system, but it's a sims like game where you grow crops, tend to livestock and try to get married. I find it very amusing, but you may not.
Astro boy by sega is supposed to be a very entertaing sidescroller.
Mario and Luigi: super star saga is a very fun role playing game.
In fact, if you're nostalgic, u can pick up practically all the old mario games remade for gba.
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