https://store.steampowered.com/app/1547470/PewPew/
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STEAM KEY REGION FREE GLOBAL

PewPew! - arcade Shoot `em up game. You control a spaceship and your task is to defend against the attack of aliens, whose attack is gradually accelerating. In some stages of the battle, you will have to fight the boss!

At the end of each battle, you can upgrade your starship using points accumulated during the battle.