Holy Crap. This is so addictive. It reminds me of the old school shooters back in the day. It also shows that graphics aren't everything in a game, and that a game doesn't have to have amazing graphics to be good.
Screenshots:
You can download the latest version here:
http://www18.big.or.jp/~hikoza/Prod/...cgi?product=wf
The farthest I have gotten is stage 15.
Enjoy! I can answer any questions you have here.
--MM--
EDIT: Here are the controls.
Arrow Keys = Move Around
Z = Fire
D = Aimer. An Aimer is used to focus your shot on a particular point. It is also used to shot sideways/down/etc.