I like the game but theres a few things I'd suggest to improve.
1) When you die there isn't an obvious way to restart the game without refreshing the browser. I can see in the description that you can press Enter but I didn't notice this right away. Could that be shown on screen when you lose?
2) The background is very busy and Chicken blends in to the background. Perhaps they could be a different colour so that they stand out more?
Keep it up!