Thank you :)
Well, I have been experimenting with augmented reality for a while . So yes it takes some time to figure out what is the right method to make this kind of system work, but for making this game itself, I didn't spend so much time solving technical issues (mostly designing the cubes for optimising the recognition, coding itself was really quick using Vuforia). At the end, I spent more time in the weekend making the content than programming.
I still have to try yours, it looks great! Cheers!