I already wrote about the integration of the Flow-Controller by Senic. Furthermore we are working on various controller layouts like this twin-stick-controller. It is in an early stage still but also functional.
We prototype with the Makey-Makey-Board which is based on an Arduino microcontroller and it gets connected via USB and recongnized as a simple keyboard. This makes prototyping extremely easy. Chaos Projectile is already playable with a keyboard: The WASD-keys move the character, the arrow-keys define the direction of aiming.
The prototype controller was shown at the ‘Under-the-Hood’-Session at AMaze Berlin last weekend:
CHAOS PROJECTILE 
