Maxime Delalande: 0:00-0:13 and 0:27-0:32
Marlène Beaube : 0:19-0:24
Thibaud Gayral: 0:25-0:27 and 0:33-0:35

I tagged "artist unknown" since I'm not sure who did the explosion at 0:08. Maxime Delalande only did the character animation for that part, it seems. 0:15-0:19 isn't confirmed, but it kinda looks like Thibaud Gayral based on the styles that I see, maybe?

Sources:
https://vimeo.com/105616997
https://vimeo.com/105568616
https://vimeo.com/100503124