Plot: Mercenary Kings is a side-scrolling shoot 'em up game developed and published by Tribute Games. The game was funded by Kickstarter and was released for Microsoft Windows on March 25, 2014 and for PlayStation 4 on April 1, 2014. Wikipedia
Plot: Broforce is a side-scrolling run-and-gun platform video game developed by Free Lives and published by Devolver Digital. Development began in April 2012 as a game jam entry and continued with developer and popular support, existing as an Early Access game. Wikipedia
Plot: Crimsonland is a top-down dual stick arena shooter video game with role-playing elements. It was developed by Finnish studio 10tons Entertainment and published by Reflexive Entertainment in 2003. In 2014 a re-release through digital distribution followed. Wikipedia
Plot: Metal Slug is a Japanese run and gun video game series originally created by Nazca Corporation before merging with SNK in 1996 after the completion of the first game in the series. Wikipedia