Vektar was written by Dzz and Craigix for the GP2X. Thanks to Craigix he allowed me to tinker with the source and I have ported vektar to use a SDL backend allowing us to play vektar just about anywhere.
I have also added:
pixel scaling (scale2x),
extended the viewing area to support the wider screen
scaled or offset the menus to look better on the widescreen
added full SDL input so nubs are supported
pandora vsync