Free vertical scrolling shooter games

Shoot ‘em up (also known as shmup or STG) is a sub-genre of the shooter genre of video games. In a shoot ‘em up, the player character engages in a lone assault, often in a spacecraft or aircraft, shooting large numbers of enemies while dodging their attacks. There is no consensus as to which design elements compose a shoot ‘em up.

 Some restrict the definition to games featuring spacecraft and certain types of character movement; others allow a broader definition including characters on foot and a variety of perspectives. Shoot ‘em ups call for fast reactions and for the player to memorise levels and enemy attack patterns. “Bullet hell” games feature overwhelming numbers of enemy projectiles.

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Vertical screen games shooter

The early days of arcade gaming are littered with vertical screen games, some of which are truly classics… Phoenix, Moon Cresta, Pleades, Space Invaders, Gyruss, Galaxians, Galaga … the list goes on. I’d say nearly all of my favorite games are actually vertical. Then there are modern day vertical shooters which still rake in the money … Raiden and variants etc come to mind.

While someone may have made a decision based upon getting something cheap at the beginning there are still companies adopting the format so it works pretty well for specific types of games.
http://vertical-shooter-games.uk.to