So, the secret is not to bump into the border, but it seemed once I sort of understood the controls it swapped directions and very quickly I was bouncing all over the place and died.
First time I selected gamepad controls and for some reason it never detected when I died. Particles just kept popping up, colliding to join or hit a charge to dissolve again. Only that I was out of the picture and not collecting any points either...
(I played the Linux version with a PS3 controller and then keyboard...)
Also, it seemed the menu didn't work with the controller. It would be useful to have that as well...
I really do love the concept!