Vessel is a unique twist on the side scrolling genre, aka Mario, in that it takes 2D elements and merges them with 3D. Not only that, but the world is truly stunning with waterfalls, deep caverns lit only the luminescent liquid creatures, swaying trees and more that you may find yourself in awe of where you are as much as what you are doing. Your job is to bring back normalcy to the world after it is overrun by liquid machines. By combining the powers of each type of liquid, you can hopefully stop their ascent and save the world from the darkness that has befallen it. Vessel is priced nicely at $14.99.
http://store.steampowered.com/app/108500/
http://store.steampowered.com/app/96400/
http://store.steampowered.com/app/94300/
http://store.steampowered.com/app/57300/
http://store.steampowered.com/app/208140/
http://store.steampowered.com/app/208140/
http://store.steampowered.com/app/33100/
http://store.steampowered.com/app/33110/
http://store.steampowered.com/app/33120/
http://store.steampowered.com/app/33130/
BTW, Alien Shooter, Alien Shooter: Revisited, Alien Shooter 2: Reloaded and Zombie Shooter are also available as a single package for $14.99 which means you actually buy 3, get one free. Pretty good…
http://store.steampowered.com/app/33180/
http://store.steampowered.com/app/211010/
http://store.steampowered.com/app/205910/