Right, well even the nugget might not warrant complete natural exploration of the map. Just having one hidden pathway through the trees would suffice. I like the idea of starting in the snow (rather original, actually), but I would still suggest adding a little more decoration to it.
Also, buh I'm bad with numerical ratings, so sorry if that 4 seems too harsh. I think people should take more away from the comments than the numbers anyway. If someone asked me why I put a 4 instead of a 5, I wouldn't know how to answer really. :P
It's not too bad, but there are many things that could be done to improve this map. First off, one of my pet peeves is the remnant of that "tree border" around the map. Obviously it helps with border errors, but when it's as obvious as that, it just bugs me. PS: tree shading. I'm not a tree shading nazi, but those don't look right. Correct me if I'm wrong. Now for other things...
Tree Placement. It's natural, sure, but does it serve any purpose to the player? A significant chunk of the map can be wandered through due to the space left between the trees. Unless the player gets something from exploring the "naturality" of the map, I'd say it's better to just give the space a more definite shape.
Purpose. It's a town. You have buildings. But several other things don't quite have me convinced. There are no tiles to indicate human presence besides the buildings, such as paths, signs, fences. While adding trees into a town adds a nice touch, here it just looks like a poorly cleared forest space for some buildings. Imagine the founders of this village clearing the forest to make habitable space; they wouldn't leave random trees obstructing invisible paths. Try to make walking paths more defined, and while removing the trees entirely isn't necessary, try to remove ones where people would walk and add more where people would not walk.
Identity. I see you're planning on inserting this into a hack. While even Nintendo doesn't always to a great job of this, I consider it important. Every town should have something that gives it its identity. For some towns, it's location (beach, mountain, desert, etc). Even though this is a starter town, it would be interesting if it was more than just a forest clearing with buildings. Do loggers live here? Maybe put in a few log piles and a stump with an axe in it (just picking decorative tiles off the top of my head). Stuff like that can instantly make a town look interesting.
Overall, it's a decent start. It just has a few basic functional drawbacks, and the rest is up to your imagination. Final rating:4/10
It's the player's start town, FYI >:]
That's the reason the map is small. Also, there is a Pokeball that contains a nugget somewhere...