Reference

Ambrosia Software Web Board > Progress logs > SketchFighter 4000 Alpha
http://www.ambrosiasw.com/forums/?showtopic=101164

Ambrosia Software Web Board > Gallery > Sneak Peeks > Sketchfighter
http://www.ambrosiasw.com/forums/?act=module&module=gallery&cmd=sc&cat=19

via

Engadget Japanese - SketchFighter 4000 Alpha：落書きシューティング
http://japanese.engadget.com/2006/02/21/sketchfighter-4000/

[N] 手書きシューティングゲーム「SketchFighter」
http://netafull.net/macosx/012622.html

読書記録ChangeLog - 2006-02-23
http://dkiroku.com/2006-02-23-6.html