Twilight Frontier released a doujin game based on Madoka. Just played it; it is awesome. It makes me wish I had friends, so I could do the three-player local co-op.
Trailer:
[video]xqblxdzpAho[/video]
Download:
GRIEFSYNDROME Download! « Quine Kal All
Z and X are for attack (press directional buttons simultaneously for different attacks, mostly on X), C is for jump. A for super attack. Super attack turns some of your life bar blue, but it recovers if you aren't hit by an enemy attack.
Sayaka's a beast by the way; just mash Z to win. Homura's the most fun to play though, what with her pipe bombs, bazookas, and mortars.