I think the motion blur here is a little too subtle. It also looks like this is a heavy crop from a larger image, if that's true try getting in closer with your camera, the quality will be better.
I find the box and the other toy really distracting from the main point here. I think you're going for the toy escaping from the box? Darker background to bring attention to the motion of the toy (visually speaking, light toy dark background, you know?)
This is a great idea - I like the creative a lot. Keep shooting this idea and working with it - there's a great photo in there!
This subject is a very good idea. I could image several of these little creatures wound up and running this way and that. It would take some planning and composition.