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Alien Shooter 2 is the D2D Casual Deal of the Day.
It’s priced $3.48 but if you use the coupon code CAG you will save an additional 20% off which makes the game $2.78. (The coupon works on all games btw.)
The game is also available at the IGN PC Store but I don’t know of any coupons that are currently active for that site. It’s basically the same site anyway lol.