Good concept, but it needs some tweeking.
It's a good game but I have two problems with it. The cube moves too fast and when it lands from a jump, I don't like that it has a tendency to slide as far as it does. I think you could slow the controls down a bit and still keep the 10 second time limit.
The other thing I would like to see is the option of using the arrow keys. I personally prefer using them over the ASWD method. And for a simple game like this, there is no reason it's not possible to use either set.
I like the idea of being a box that goes around collecting chicken though.