This great-looking shooter has a very Descent look to it, so I may end up buying it. Give a try to Retrovirus now that it has a new update:

• Reduced network traffic for all cooperative and multiplayer modes
• Reduced memory footprint after switching levels
• Added new MOBA map: Transit
• Added Multiplayer announcements for MOBA, Domination and multi-kills
• Added level scan progress to message log window
• Added Domination and Team Deathmatch support to some Deathmatch levels
• Improved dedicated server, including auto restart feature
• Improved placement of corruption in some campaign levels
• Improved joystick support
• Improved readability of control binding screen
• Improved 3DVision passive stereographic rendering (currently best with Low lighting detail)
• Replaced MOBA creeps with switching bots
• Fixed missing weapon after re-loading levels on which the weapon was acquired
• Fixed Steamworks achievements not being uploaded
• Fixed tutorials showing only default keyboard controls
• Fixed co-op spawning times lasting too long during extended engagements
• Fixed some co-op spawn points inside objects
• Fixed smoke bomb allowing many smoke screens and reducing performance