With the new version you uploaded, I get this error message. It seems that the game can't open one of the audio files.
And the techdemo works, also.
Okay, I get what happened. This is simply because the game was installed in a folder called "Jeux indés". The problem was caused by the letter "é". I think that the program did not understand this character correctly and didn't start correctly.
Oh Thanks so much! That explains it, I'll have to do some work to ensure it works with non-ascii paths. Sorry about that!