This game is
excellent. Kind of like a top-down vertical shooter, but much more simplistic and awexome.
Best of all, it's free. Download the latest version
http://www18.big.or.jp/~hikoza/Prod/...cgi?product=wf here and you'll be playing in two minutes. It can run on pretty much any type of computer, too.
I'd put screenshots, but you really have to experience it for yourself.