Mercenary Kings - Mercenary Kings is a wonderful combination of Action-packed Side-Scrolling Run and Gun and Platforming video game by Tribute Games.
Soldat - Soldat is a 2D Run and Gun, Fast-paced, Single and Multiplayer video game created and published by Michal Marcinkowski.
Metal Slug - The definitive, side-scrolling bullet hell platformer.
OpenLieroX - OpenLieroX - extremely addictive realtime worms shoot-em-up backed by an active gamers community. Play the most famous Liero clone! Windows, Linux and Mac OS X version available.
Mark of the Ninja - Mark of the Ninja is a fast-paced Action-Adventure, Side-Scrolling, Platform and Sword fighting video game that lets you be a skilled Ninja who embarks on an epic journey to defeat the enemies who attacked on his DOJO.
Armajet - Free-to-play multiplayer jetpack combat shooter for mobile.