Terranigma is SUPPOSED to be that way.
Even though you're not given a lot of information throughout the game, the whole things flows together and builds up to the final events of the game, and the enormous twists of the story. It's just not about all the individual motivations and characters like The Way, it's all about you as Ark.
At any rate, it was something that appealed to certain people a whole lot. It was DIFFERENT.
But no one can say it didn't have an incredible ending.