0:03 ~ 0:07 Bernard Bui
0:19 ~ 0:21 (one cut) Gianni Bouyeure
0:24 ~ 0:26 Bouchart fx
0:34 ~ 0:34 Bouchart fx
0:35 ~ 0:36 (one cut) Bouchart fx
0:37 ~ 0:39 Chhun with Bouchart fx
0:40 ~ 0:42 Chuun
0:43 ~ 0:50 Lebon with someone else doing effects
Bouchard is one of two 2D fx animators credited (along with Martin Robic) so I can't tell how much of the fx are his