Art looks very good in this game. Gets across the tone you're going for very nicely. It's fun to watch the animals destroy the objects.
My biggest complaint is the use of arrow keys and mouse simultaneously. Since i used a mouse with my right hand, I had to reach my left hand over to the arrow keys which isn't comfortable. I would just swap the arrow keys with WASD, or better get make the camera move when the mouse is at the edge of the screen like in an RTS.
Good work!