The original Neon Abyss is a roguelike run-and-gun shooter whose most memorable feature was the ability to wield a cat as a gun. I found the game to be whelming, but not overwhelming. Co-op support would surely have improved its staying power. Thankfully, Neon Abyss 2 from Veewo Games and Kepler Ghost will kick things up a few notches thanks to the inclusion of 4-player online co-op. The new Steam demo shows off that co-op support and lots more.