Ok, here's some tips.
#1. If you do a Star Wars film, shy away from using the classic "scrolling text." It's over-used, and eats up too much screen time. (Also, while the font size was fine for the title and 'Star Wars", it was way too big for the rest of the text.)
#2. Titles like "Lightsaber duel" or "Episode 1" are quite common and generic, I suggest getting something more original and descriptive.

OK, this had a lot of flaws common to beginners, (Like light flicker, poor angle choices and cinematography, basic set, and choppy animation.) but I'm going to comment instead on one positive aspect of the short. The "Force-pull the saber into the guy's back and ignite it" aspect. I know this sounds weird, but I think the Jedi way under-use the Force, and rely too much on their saber skills. I like seeing more inventive and sneaky ways of fighting that utilize the full power that the force can provide.

But while that was neat, the rest of the short could use a lot of work. I recommend not only trying to polish up your work, but also checking out the French Brickfilming site Brick-a-brack.com. As it may be easier for you to get and give feedback in your first language. That's not to say you should leave here, but posting on both sites will get you twice as much help and comments.