If you're like me and have been living in a hole and haven't played Crimson Clover then STAHP and go buy it. At this price it's a steal. That game is insane fun. Thanks GE!
+1
As for the other games:
Raiden III - It's worth having. I think the Taito Type X version looks a little better, but it could just be my video card settings. PC version adds score attack mode and high score saving. (also supports vertical monitors)
Humans Must Answer - Meh, everything feels slow including the controls. I wouldn't buy again.
Raptor - Meh, Feels like a less than mediocre game from the mid 80's. The controls are nice and crisp, but I wouldn't buy again.