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Expanded games
Zakesta-Z is the newest version of the shoot 'em up that challenges players to blast their way through a total of five stages, with a main shot that can be powered up 5 levels and an array of sub-weapons that can be powered up 3 levels. The game also includes a stage select feature that allows players to practice previously-cleared stages with infinite lives, as well as a sound test that unlocks upon clearing the game.
Could be interesting
Astro Tripper is a furious shoot-em-up experience inspired by the painful, knuckle busting video games of years gone by. An evolution of PomPom's 2001 award winning game, Space Tripper. Travel the surface of large horizontally-scrolling platforms, and pit your highly maneuverable craft against hoards of enemies eager to blow you to bits, eat you or worse.
Chopper I is a 1988 arcade hall video game, developed by SNK. The objective of this top-down game is to infiltrate enemy territory and essentially destroy all objects. The game can be played with 1 or 2 players; both players, each occupying one helicopter, play simultaneously.
MadRobot X is an old school shoot 'em up game. You control a robot trying to escape from the laboratory of a mad scientist, and to accomplish this, you'll need the help of GoboGobo, another robot who also wants to escape.
Gundhara - Juudan Arashi is a 2D top-down shooter, similar to Commando, Ikari Warriors or Bloody Wolf. The game has two heroes: Jerry and Jinn. Gameplay is simple and dynamic - the chosen hero shoots various enemies (like soldiers and robots) in the jungle and other location, and rescues hostages. A big boss awaits at end of each level. The heroes have guns, but can kick, upgrade their guns, and use special weapons.
Mad Shark is an Action game, developed and published by Allumer, which was released in 1993.
XMinutes: Wings is a shoot-em-up that will test your reflexes by placing you against hordes of increasingly harder enemies, your objective? Survive for a whole minute.
A retro 2D vertical scroll shooter.
This is a mini-game shmup. Defeat all 20 mid-bosses. When the last boss is defeated, it is the end.
Raioh is a retro style shot and bomb style vertical scroll shmup.
A freeware 2.5D vertical scrolling shoot 'em up developed by M.Nagahashi from Japan.