https://store.steampowered.com/app/1065670/4004022/
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STEAM KEY REGION FREE GLOBAL

In the year 2040 you and the 12 billion inhabitants of the Earth fled from the Earth after being attacked by extraterrestrials, you took refuge on a planet named 4004-022, but this planet is also being attacked by aliens.

Kill waves of enemies that will be stronger and stronger as the days go by.

Upgrade your spaceship and buy equipment to defeat these enemies and protect the planet.

Main features
★ Buy new upgrades for your spaceship.
★ Buy equipments from friendly Aliens.
★ Increasing difficulty over time.