k1d
Still Fresh
Someone must/should be working on those. Some of the best freeware abstract shooters. They use SDL too. And Noiz2sa has been already ported for the gp32 by Chui.
http://www.asahi-net.or.jp/~cs8k-cyu/windows/noiz2sa_e.html (the zip-file includes the source)
http://www.asahi-net.or.jp/~cs8k-cyu/windows/noiz2sa_e.html (the zip-file includes the source)