thedopefish has updated his port of OpenTyrian for Nintendo DS.

OpenTyrian is a port of the DOS shoot-em-up Tyrian. Tyrian is an arcade-style vertical scrolling shooter. The story is set in 20,031 where you play as Trent Hawkins, a skilled fighter-pilot employed to fight Microsol and save the galaxy.

Changes:

Fixed a bug that was corrupting save games, causing a crash when you tried to load the game.
Removed the horizontal scaling in most places, to make the text easier to read. On some screens you may need to scroll slightly left or right; use the L and R buttons for this. If you prefer the old scaled mode, you can toggle this feature on the OpenTyrian menu.
Added menu options to start Super Arcade mode or Destruct, from the OpenTyrian menu.

Discussion: http://forum.gbadev.org/viewtopic.php?t=15239&start=45

http://vespenegas.com/tyrian.html