A couple of years ago there was a blog post on the libretro main page regarding SDL libretro proof of concept, where a libretro port of OpenTyrian was announced.
Since then, I haven’t heard much in regards of this project, and it’s github page hasn’t got a commit for over a year.
An other project that sparked my interest was the libretro port of Reminiscence, an engine reimplementation of the old game Flashback (in some ways the ultimate way of enjoying this classic game in my opinion). This port looks as of now very decent (it’s even featured in the Online Updater of RA), but it’s missing the main menu itself; the game just jumps right into gameplay after the intro-sequences are either done or skipped.
I wonder if those libretro cores are still planned to be worked on any further; both a fully featured OpenTyrian- and Reminiscence libretro port would have been great!