As described by Imerion, the game developer, Prometheon is an action jump-and-run platformer with lots of shooting and light adventure elements. It has a big focus on variation as well as a slightly rpg-like story with multiple paths.
The game can be downloaded from its home page : http://neotron-games.blogspot.se/2013/02/prometheon.html
Or from JameJolt (where can be played immediately without downloading it): http://gamejolt.com/games/platformer/prometheon/12245/
Imerion is looking for feedback on the forum,/a>, so go ahead and try the game!