I started producing this very simple little game that is called Kubridge.
The principle is to reach the orange platform on the top of level. By following this idea, it is now to make a whole set of new levels thereby grow the value of this project.
For further explanations, download the game or download the source of the game, you have to go to this address: http://gregdesign.ch/kubridge-un-jeu-video-cree-avec-le-blender-game-engine
I count on the constructive comments but also the possibility of generating linux or mac versions from the community as possible
Programmers who want to improve gameplay features are welcome.
It remains for me to wish you a happy discovery !