I got it. Its good, one of the best games of its type on the gba..but I, unlike most, don't think its better than the original.
Its essentially a remix of the md version, with extra levels, some nice effects thrown in. And of course, Treasure style, the bosses are mostly awesome. Trouble is, cos of the screen size and sprite size the action never gets that hectic, as it did on the md version. It suffers as a result.