One of the first titles I checked out for the Indie-Ana Co-Op feature was Overdriven - a 'shmup that supports up to four players locally. Four years after its initial release, the title has been enhanced and ported to the PC as Overdriven Reloaded.
While the graphics have gotten some tweaks, the big selling point here is the addition of new game-modes, all of which can be played cooperatively with three other players locally. The new modes include:
Manic - play through the entire story, without a health bar. One hit and you're dead! The Line - take on waves of enemies as you try to reach a line that keeps moving away from you. Every enemy killed brings the line closer to you, but should the line ever go off screen, you lose. Puzzle-Maps - 56 levels that utilize the ship color changing mechanic in order to try and match 3 with your bullets.Overdriven Reloaded is available now on Steam for $8.99.