Halley Wars is a sequel to the 1986 arcade shoot 'em up Halley's Comet. It was also previously released for the Famicom Disk System.
Extra Options#
At the title screen, press Left, Left, Left, Left, Right, Right, Right, Right and then start the game. The menu will now have a level select and sound test added, plus settings for speed, weapon level, and lives.
(Source: GameFAQs (Mesmorize99))