I'm rating this based on preference as I recognize this is a wholly well-done game. But the mindless shooting gameplay isn't changed one iota from the original and this just is not the game for me.

Good game. It's basically a shooting gun game that you control the character to move side by side from left of the screen all the way to the right. It's a fixed screen you have a target which you use that to aim to destroy enemies. Difficulty settings ranging from beginning to hard.