Version 0.0.8 of Defendguin is now available.
(It’s only been, what, a year!?)
Only a few minor tweaks in graphics and documentation (it has a MAN PAGE now!)
and a little more work on the Options screen. (I’m one sick fsck)
http://www.newbreedsoftware.com/defendguin/
(“Defendguin” is a bidirectionally scrolling shooter game based on the
classic arcade game “Defender.”)
Enjoy! 
-bill!