I'll rate this 3/6
1 point for the idea of doing a round shaped town and pulling it off somewhat good.
1 point for doing it playable, as far as I can see at least.
0.5 points for doing something custom in both map and sprite.
0.5 points for the mickey mouse head shaped building.
What made me not rate it higher (in constructive criticism)
1. It's far out so we can't see much, you should at least add some close-ups so the details can be seen.
2. From what I can see there's a lack in details, could be cuz it's zoomed out, could be cuz of the sprites. But you should look at some nature. Many people suggest to look at the most popular threads in the mapping showoff. I'd rather direct you to the mapping competition threads where you can look at contests from over a year ago and see which one of them you like the most and also look at the pieces with the most votes (not only winner). This way you know what most people like while also seeing what you yourself like.
3. the smaller circle looks poorly made, mostly the nature. Try to remake it after looking at some other images.