It was a few months back that Atom Zombie Smasher caught our attention with its three player co-op tower defense like gameplay. Players take control of a section of a city and use various methods to rescue as many citizens as they can. While we enjoyed the title it did have two downsides in our opinion -
It wasn't available on Steam for easy purchase. It was priced a bit too high.
It seems both of those grievances have been taken care of now that developer Blendo Games have released the title on Steam, added achievements, and dropped the price $5. Even better, to celebrate the launch the game is on sale another $1 off a limited time and supports Steam Play for Mac and PC.