Babylonian Twins isn't for the casual gamer. It's not for people whose only time spent gaming consists of a quick blast on Flight Control on the way to work. It's for true gamers who thrive on a challenge.
That's not to say that Babylonian Twins is a relic, likely to appeal only to those of a certain age who were around to bemoan the lack of a release the first time around. Its mechanics and revamped style hold up beautifully against any number of iPhone alternatives, and should find an audience among discerning younger gamers. After 16 years in the wilderness, it certainly deserves to.