Well....
I don't speak french, so I don't know what the song is telling, execpt for one of two english lines. It was nice though.
The grapics are great, very full of movement and nice color.
The backgrounds were nice too, even thouh they could have used some more color sometimes, unless it has alot of gray on purpose.
They stlye is simple and nice, again the animacion is soo full of movement. In every spot there is the sugguestion of movment, of action, life. It doas not give too much detail, instead it focuses on the movement and simple charectiristics of the objects.
For the story.... Well, these are what my father's generacion would call "violet cloud" producion. It means that nobody has a clear idea on whats going on, except the creator of the thing. Certain things are quite clear though, certain acions. No names, just see mimifacion of the charecters.
But I guass thats the point. To inspire your imaganacion.
It seems that the youth of the city all has combat training and like to practise on each other, plus to practise death risk acrobatics with each other. Some of them seem to have superneutral powers or abilityes.
I olso liked the violence. Not brutal or bloody, more focuses on the fun of fighting, of the challenge, the movement. It doas suggest violence, but its more like kids cartoon like violence. The charecters fight like if they are danceing.
All in all, its a very inspireing animacion, something to make your mind go and relax.
Suggesion:
make a pouse/play bottun :). Olso color the charecters skin a bit, to give even more movement and color.