Very cool. Not sure this was meant to happen, but at one point I did a double jump over a wall and then just started to continuously fall and it never stopped.
It's a 16x16 screen world which wraps around, if you move to the left or right you should eventually land on a non-empty screen. The "world" is anything but finished, to be honest, it's more of a debug / feature test world than anything else at the moment :)
