Doujin game developer Twilight Frontier released a couple videos showing off their latest game, Grief Syndrome, a sidescrolling run 'n gun shooter based on Puella Magi Madoka Magica. Up to three players can play together on PC. It was supposed to go on sale at Comiket in Tokyo this weekend for 1000 yen (about US $13), but according to 0taku, it'll be about a month late.
Here's the trailer:
And a gameplay video of the first level: