Recently, developer PixelMouse launched a new promotion on Steam. He is offering players a free copy of Distant Space.
This is a shooter with minimalistic graphics in the spirit of the classic Space Invaders: you need to shoot down waves of attacking enemies.
You can add Distant Space to your Steam library via the following link; the giveaway runs until October 31st.
The game has collectible cards, and if you get Distant Space during the promotion, you won't be able to knock them out.