soundodger+ (referring to it as sd+ for brevity) is probably the most well known version of the game and it fixes some of the jank found in soundodger classic. the biggest addition to sd+ include a handful of new levels, dlc packs, and whatever the hell solvalou is.
quick sidenote: solvalou is named after the game xevious, a shmup for the atari 7800 where you controlled a ship named the solvalou, so thats that