Wow, this is amazing. I think I was able to explore everywhere you can go, and got several items. Sure hope you flesh this out with more places to walk – I'd love to explore more than just main street!
I particularly enjoyed the flowers waving as you walked through them, the compass change that lets you feature the frontage of buildings no matter what direction they face in the real world, and of course, the duck.
About the only suggestion I have would be to let the duck walk diagonally when you have two arrow keys held down. Other than that, it's just charming and engaging. Please continue working on this and releasing updates!