Can recommend this game:
http://www.youtube.com/watch?v=y2kBH2LJvCYI'm dead serious, I've never played a better top-down shoot-em-up.
This is a new and updated version, by the way; I originally played the first version, which came out 10 years ago. On another note, I can't confirm this but I'm almost certain this was the first game to invent the "perks" level-up concept which Fallout 3 eventually took and made famous a few years later.
