The arcade-style FPS returns! Wrack is an arcade-style FPS that draws inspiration from classic games across multiple genres -- Doom, Contra, Mega Man, etc. -- that puts its own unique spin on things! Between its fun and unique gameplay, its vibrant cel-shading, and its compelling characters, Wrack strives to be a modern day classic! Play as Kain Sager - the one man prepared for a crisis in a utopian future. Battle your way past hordes of monsters, traps, and bosses as you single-handedly take down an invading alien empire, and save mankind from certain doom!
I can say as I owned the game before Desura that this is a great game and is made by the same guy who did the Skulltag port for Doom (which is also awesome)
Sure there are only four levels (currently) but if you check the Wrack forums there are usermaps in dev and being released.
Best $10 you can spend really.