FREE: Planets under Attack [steam key]

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http://store.steampowered.com/app/218510/Planets_Under_Attack/

Planets under Attack - an exciting strategic adventure, suitable for both experienced and novice players. It is easy to start playing, thanks to intuitive-simple controls and clear mechanics. And those who want to become a real master, will find behind the pleasant cartoon graphics, memorable characters and light music of enough tactical depth to entice him for long hours.
The goal of this exciting space adventure is to capture a galaxy full of unknown star systems, performing various missions. Lead a mighty armada of spacecraft and carry destruction to your enemies, but choose goals carefully! The planets you capture will bring you new ships and tax charges, but each attack costs resources and takes some time, leaving you open to a counterattack. Enemies will attack from all sides, and resist as hard as you try to capture their planets. The main thing is not to panic and act reasonably! Go to the attack? Strengthen their planets? Accumulate troops on the front line or leave defense in the rear? Decisions will have to be made swiftly and on several fronts at once. Gently and quickly choose the tactics and sequence of actions, and you will succeed, but you should relax and lose your grip, as the enemy will crush your space army!
In campaign mode, you can compete with opponents on 32 exciting levels, in different game modes. Protect the planet before reinforcements arrive, fly to the unknown, take over the planets and strengthen the defenses - you will find what to do in your space adventure. At first the tasks will be simple, but as you move to the center of the galaxy, the complexity will grow. The more you play, the more experience you will get, discovering new technologies that can change your playing style and rethink already known strategies.