The demo available from Rock, Paper Shotgun over this weekend. grab it here: http://www.rockpapershotgun.com/2011/08 ... sive-demo/. there's a version for Windows, Mac OS X and Linux available.
The game itself is an arena shooter, with a cool skill based branching paths system and lots of varied levels. There's a bit more info here: http://www.charliesgames.com/wordpress/?page_id=21, you can also pre-order on that page, and get the beta of the full version if it's your sort of thing.
I'd love to hear what you guys think. For what it's worth, i think it's worked out pretty well, even if i do say so myself

Oh, and it looks like this:

and this:

Anyway, i'm off to play some more Ketsui. I WILL 1cc it!
Have fun.
Cheers
Charlie