U.N. Defense Force: Earth Joker (Japan, prototype?)

A.D. 2026. The earth feels the onslaught of total takeover from a hostile and powerful enemy. They call themselves Slytow. All the countries of the Earth fall before there might. The military is powerless against the Slytow. The few who survive flee out to space to form colonies, based on their former nations. Their dream: to regroup and wrest control of the earth from the Slytow.

Earth Joker - U.N. Defense Force is a Vertical Shoot-'Em-Up, developed and published by Visco Games, which was released in 1993. The player can pick from four different ships, and has to go through seven stages. The ships are equipped with a charge laser, that can be used holding down the fire button.