Uridium

Your home solar system of 15 planets has been attacked by a horde of Super Dreadnoughts, from a race who wish to harvest your universe's minerals for their own use.You must pilot your craft through some of the hardest levels ever created and shoot down all the enemy space craft and ground weapons, and avoid the many indestructible hazards. The innovation is that you do not simply travel in a single direction, but instead move from left to right or right to left depending on where the current targets are, in a manner more similar to Defender than most shoot 'em ups.