We have thought about how to release "Nikki and the Robots" for a long time, and this is what we finally came up with...
First, there will be the "Edit Mode", a fully playable version of "Nikki and the Robots" featuring various levels, a level editor, and online functions. This will be released as free software (under LGPL and Creative Commons).
And then, towards late 2010, we will release our "Story Mode", which will tell the adventure around Nikki, Dr. Lacroix and the robots in four episodes. These episodes will be available for download for a rather small amount of money.
We think this will be a very attractive way of distributing our game, and we will be talking about more details soon!