Here Is The Space Galaxy: Space Shooter Game.
In the cool online Space Galaxy game, you're thrust into the role of a lone hero tasked with fending off an enemy space fleet's assault on Earth. Many missions await you, each more challenging than the last, and each one requires you to wipe out every single enemy and destroy the enemy flagship cruiser.

What Is Space Galaxy?
Top-down shooter and space battle hard-core game "Space Galaxy". Space Galaxy is designed for those who like simulations of sky shooting for glory and duty and who enjoy games that have space-shooting survival elements. You needed more than just the ability to think quickly on your feet and anticipate the movements of hostile alien space invaders. A thrilling and addicting enormous galactic war game with a ton of missions and spacecraft upgrades, this space shooter is a blast.