Great game of the past
the characters movement can sometimes get annoying, and the camera is sometimes a problem, but that goes along with most games of this caliber where you're running through canyons and swimming underwater.
the opening level itself is pretty neat, the end giant boss, and you have to make you're way down into his massive den. the game's got that eerie feel throughout it all, really a great achievement and i believe it set many standards for puzzle/shoot-em-up games to come.