Minish Cap is the absolute best looking game on the GBA. Additionally, its one of the best 2D Zelda games. They had to deal with a smaller overworld because of the limitations of the handheld, so they compensated with a shrinking gimmick that allowed you to fit entire dungeons in small areas around the map. This game hooked me from the first dungeon, when the main boss was revealed to be a common chuchu that found its way into your tiny dungeon. Just incredibly charming all around.