Yeah okay so this is old news, but better late than never I guess. The author of Project P has released a demo of his upcoming game Super Bat Puncher.

Explore the deep, dark caverns of a mysterious planet and find out about the plague that threatens Earth.
The game features...

• Good old platforming fun
• Special moves
• 2-Player mode
• A delightful soundtrack composed by Dave Harris
• Explicit bat punching!

The demo can be downloaded here.