Changes since 0.0.4 include:
* Better framerate.
* Improved sprite collision detection.
* New display format to make the game more "shooter-like".
And misc unspecified bugfixes.
ketm is (or will be someday) an old-school 2d-scrolling shooter. Because it
is based on SDL, it is no problem to port it to different plattforms. For
the moment it runs on Linux (i386/PPC), FreeBSD, Win32 and BeOS.