Many things make this better than before...
Mainly the addition of crosshairs, and the double crosshairs to get rid of the crowds. The double gun system works much better, and the game was even more fun than the original. The only problem was when multiple enemies came on the screen at once, trying to fire and shoot them to quickly made the game freeze up and lag really bad, but thats really the only problem. Maybe more weapons would work to, maybe start with 2 pistols, then shotguns, then uzis, then ass. rifles , rocket launchers, etc. All in all a perfect game, and in many ways better than the original.