Ginga Teikoku no Gyakushuu (c) 1980 Irem.
You pilot an arrowhead-shaped vessel at the bottom of the screen, facing off against four different types of enemies. Certain enemies drop 'space soldiers' when shot, if these make it to the bottom of the screen, they will try to 'spear' your ship from behind.

>>> TECHNICAL DETAILS
---------------------
Main CPU : Z80 (@ 3.072 Mhz)
Sound Chips : Tone generator and discrete circuits
Screen orientation : Vertical
Video resolution : 224 x 256 pixels
Screen refresh : 60.61 Hz
Palette colors : 98
Players : 2
Control : 2-way joystick
Buttons : 1

>>> TRIVIA
----------
Released in November 1980.
The title of this game translates from Japanese as 'Counter-attack of the Galactic Empire'.
This game is known outside Japan as 'UniWar S'.

>>> OTHER GAME RESOURCES
---------------------
Game's rom.