It's funny, the game remind me a scene in the stop motion animation movie Chicken Run
I absolutly love this idea of controling multiple characters at once but I think the level design don't make enough use of that mechanic.
The question of the camera also arises, who the camera must follow ? The most advance chicken, or this pack that stay behind and had more "value" than the solo chicken, does zooming out can be a better idea than a fixed camera, etc
I hope I'm not being too harsh here, I think there is a lot of under-exploited potential here. Good job though